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      "reason": "Same work and catalogue number; title variant.",
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      "reason": "Same work and catalogue number; title variant.",
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      "reason": "Same work and catalogue number; title variant.",
      "evidence": "https://imslp.org/wiki/List_of_works_by_Charles-Marie_Widor"
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    {
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      "author": "Charles-Marie Widor",
      "reason": "Same work and catalogue number; title variant.",
      "evidence": "https://imslp.org/wiki/List_of_works_by_Charles-Marie_Widor"
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      "author": "Charles-Marie Widor",
      "reason": "Same work and catalogue number; title variant.",
      "evidence": "https://imslp.org/wiki/List_of_works_by_Charles-Marie_Widor"
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      "oldTitle": "Symphony on a French Mountain Air, for piano and orchestra, op. 25",
      "title": "Symphonie sur un chant montagnard francais, op. 25, \"Symphonie cevenole\"",
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      "author": "Vincent d'Indy",
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      "title": "Piano Trio in D minor, for clarinet, cello and piano, op. 3",
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      "reason": "Same work and catalogue number; title variant.",
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      "oldTitle": "Psalm 13: \"Klage und Vertrauten in grosser Not,\" for chorus and orchestra, op. 24",
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      "author": "Alexander von Zemlinsky",
      "reason": "Same work and catalogue number; title variant.",
      "evidence": "https://api.openopus.org/work/dump.json"
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    {
      "action": "merge",
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      "oldTitle": "Psalm 23: \"Der gute Hirt,\" for chorus and orchestra, op. 14",
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      "author": "Alexander von Zemlinsky",
      "reason": "Same work and catalogue number; title variant.",
      "evidence": "https://api.openopus.org/work/dump.json"
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      "title": "Serenade for strings in E flat major, op.  6",
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      "reason": "Same work and catalogue number; title variant.",
      "evidence": "https://api.openopus.org/work/dump.json"
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    {
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      "oldTitle": "Pieces, op.  22a \"Spring\"",
      "title": "Jaro, op. 22a",
      "author": "Josef Suk",
      "reason": "Same work and catalogue number; title variant.",
      "evidence": "https://api.openopus.org/work/dump.json"
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    {
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      "author": "Josef Suk",
      "reason": "Same work and catalogue number; title variant.",
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      "reason": "Same work and catalogue number; title variant.",
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      "reason": "Same work; RV in source title is a mistyping of the RT catalogue prefix.",
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      "title": "Adagio in E major, for violin and orchestra, MS49",
      "author": "Niccolò Paganini",
      "reason": "Same MS49; E-flat in source is erroneous. E major is documented by the record label.",
      "evidence": "https://www.naxos.com/CatalogueDetail/?id=CDS450"
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      "author": "Max Reger",
      "reason": "Same Albumblatt WoO II/13; B-flat refers to the clarinet, not the key. The key is E-flat major.",
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      "title": "Albumblatt in E flat major, for clarinet and piano, WoO II/13",
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      "action": "correct",
      "id": "opus-8017063c722f999e",
      "author": "Wolfgang Amadeus Mozart",
      "oldTitle": "Adagio and Rondo for Glass Harmonica, K.356",
      "title": "Adagio and Rondo in C minor, K.617",
      "reason": "Source incorrectly attached K.356 to the Adagio and Rondo. K.356/617a is the separate solo Adagio.",
      "evidence": "https://dme.mozarteum.at/DME/objs/pdf/nma_202_-40_-3_eng.pdf"
    },
    {
      "action": "merge",
      "id": "opus-8017063c722f999e",
      "into": "opus-097ae94550bf6069",
      "oldTitle": "Adagio and Rondo in C minor, K.617",
      "title": "Adagio and Rondo in C minor, K.617",
      "author": "Wolfgang Amadeus Mozart",
      "reason": "Same K.617 after correction; kept separately from the solo Adagio K.356.",
      "evidence": "https://dme.mozarteum.at/DME/objs/pdf/nma_202_-40_-3_eng.pdf"
    },
    {
      "action": "correct",
      "id": "opus-dc02a9318f9dc6a4",
      "author": "Edvard Grieg",
      "oldTitle": "6 Poetic Tone-Pictures, op. 2",
      "title": "6 Poetic Tone-Pictures, op. 3",
      "reason": "Source incorrectly used Op.2; the Grieg Society thematic work list identifies Op.3.",
      "evidence": "https://griegsociety.com/wp-content/uploads/2015/10/List-of-works_opus-1-to-74.pdf"
    },
    {
      "action": "correct",
      "id": "opus-3628a52e37fb416c",
      "author": "Johann Strauss Jr. and Josef Strauss",
      "oldTitle": "Pizzicato Polka, op. 234",
      "title": "Pizzicato Polka",
      "reason": "Removed erroneous Op.234 (which identifies Accelerationen). Joint authorship documented by the Morgan Library.",
      "evidence": "https://www.themorgan.org/music-manuscripts-and-printed-music/85510"
    },
    {
      "action": "correct",
      "id": "opus-1b33a74f25143710",
      "author": "Carl Philipp Emanuel Bach",
      "oldTitle": "6 Leichte Clavier-Sonaten, Wq.53, H.1",
      "title": "6 Easy Keyboard Sonatas, Wq.53",
      "reason": "Removed erroneous single H.1 reference: this is a six-sonata collection with separate Helm numbers.",
      "evidence": "https://imslp.org/wiki/List_of_compositions_by_Carl_Philipp_Emanuel_Bach_by_Helm_Numbers"
    },
    {
      "action": "merge",
      "id": "opus-f56ba0993a18bece",
      "into": "opus-fe79edb20a8586b7",
      "oldTitle": "6 Violin Concertos, op. 11",
      "title": "6 Concertos for 2 Violins, Viola, Organ and Cello, op. 11",
      "author": "Antonio Vivaldi",
      "reason": "Same published six-concerto collection, with inconsistent instrumentation in source titles.",
      "evidence": "https://imslp.org/wiki/6_Concerti,_Op.11_(Vivaldi,_Antonio)"
    },
    {
      "action": "correct",
      "id": "opus-fe79edb20a8586b7",
      "author": "Antonio Vivaldi",
      "oldTitle": "6 Concertos for 2 Violins, Viola, Organ and Cello, op. 11",
      "title": "6 Concertos, op. 11",
      "reason": "Collection title avoids falsely describing every concerto as a violin concerto.",
      "evidence": "https://imslp.org/wiki/6_Concerti,_Op.11_(Vivaldi,_Antonio)"
    },
    {
      "action": "merge",
      "id": "opus-500204cb053e88a4",
      "into": "opus-e1663434a337944d",
      "oldTitle": "6 Violin Concertos, op. 12",
      "title": "6 Concertos for Violin with 2 Violins, Viola, Organ and Cello, op. 12",
      "author": "Antonio Vivaldi",
      "reason": "Same published six-concerto collection, with inconsistent instrumentation in source titles.",
      "evidence": "https://imslp.org/wiki/6_Concerti,_Op.12_(Vivaldi,_Antonio)"
    },
    {
      "action": "correct",
      "id": "opus-e1663434a337944d",
      "author": "Antonio Vivaldi",
      "oldTitle": "6 Concertos for Violin with 2 Violins, Viola, Organ and Cello, op. 12",
      "title": "6 Concertos, op. 12",
      "reason": "Collection title avoids falsely describing every concerto as a violin concerto.",
      "evidence": "https://imslp.org/wiki/6_Concerti,_Op.12_(Vivaldi,_Antonio)"
    },
    {
      "action": "merge",
      "id": "opus-f6feb4d1ae29bd1d",
      "into": "opus-9a0d7d70430f8ec1",
      "oldTitle": "Concerto a 5 in D minor, op. 9, no. 2 for Oboe, Strings, and Continuo",
      "title": "Concerto a cinque for Oboe, 2 Violins, Viola, Cello, and Continuo in D minor, op. 9, no. 2,",
      "author": "Tomaso Albinoni",
      "reason": "Same work and catalogue number; title variant.",
      "evidence": "https://imslp.org/wiki/Oboe_Concerto_in_D_minor,_Op.9_No.2_(Albinoni,_Tomaso)"
    },
    {
      "action": "merge",
      "id": "opus-8a9c549ef3bc92b0",
      "into": "opus-50bc7e1fa0975df6",
      "oldTitle": "Fantasie no. 1 in C major, op. 7",
      "title": "Fantasía, op. 7",
      "author": "Fernando Sor",
      "reason": "Same Op.7 but imported ordinal/key are erroneous. The score identifies C minor.",
      "evidence": "https://imslp.org/wiki/Fantaisie,_Op.7_(Sor,_Fernando)"
    },
    {
      "action": "correct",
      "id": "opus-50bc7e1fa0975df6",
      "author": "Fernando Sor",
      "oldTitle": "Fantasía, op. 7",
      "title": "Fantaisie in C minor, op. 7",
      "reason": "Removed erroneous source ordinal and C-major designation from the duplicate.",
      "evidence": "https://imslp.org/wiki/Fantaisie,_Op.7_(Sor,_Fernando)"
    },
    {
      "action": "correct",
      "id": "opus-21c14df3257e6397",
      "author": "Béla Bartók",
      "oldTitle": "Piano Concerto no. 1 in A major, BB91, Sz.83",
      "title": "Piano Concerto no. 1, BB91, Sz.83",
      "reason": "The work and catalogue numbers are documented. The imported A-major key label is not relied on in the display title.",
      "evidence": "https://imslp.org/wiki/List_of_works_by_Béla_Bartók"
    },
    {
      "action": "correct",
      "id": "opus-34aaadb954286ec7",
      "author": "Béla Bartók",
      "oldTitle": "Violin Concerto no. 2 in B minor, BB117, Sz.112",
      "title": "Violin Concerto no. 2, BB117, Sz.112",
      "reason": "The work and catalogue numbers are documented. The imported B-minor key label is not relied on in the display title.",
      "evidence": "https://imslp.org/wiki/List_of_works_by_Béla_Bartók"
    },
    {
      "action": "merge",
      "id": "opus-b4576723d8982963",
      "into": "opus-20c137954a901739",
      "oldTitle": "Pange lingua, WAB 32",
      "title": "Tantum ergo, WAB 32",
      "author": "Anton Bruckner",
      "reason": "Same WAB32: Pange lingua is the text/title used in the 1914 edition, not a separate composition.",
      "evidence": "https://imslp.org/wiki/Tantum_ergo,_WAB_32_(Bruckner,_Anton)"
    },
    {
      "action": "merge",
      "id": "opus-eee8abb35e9df9fa",
      "into": "opus-dfa7b3fdfc0a6e24",
      "oldTitle": "Cello Sonata in G minor, op. 34, KiV 196",
      "title": "Serenata for Cello and Piano, op. 34",
      "author": "Ferruccio Busoni",
      "reason": "BV196 identifies the Serenata for cello and piano; the imported Sonata label is erroneous.",
      "evidence": "https://imslp.org/wiki/List_of_works_by_Ferruccio_Busoni"
    },
    {
      "action": "correct",
      "id": "opus-dfa7b3fdfc0a6e24",
      "author": "Ferruccio Busoni",
      "oldTitle": "Serenata for Cello and Piano, op. 34",
      "title": "Serenata in G minor, for cello and piano, BV196, op. 34",
      "reason": "Canonical title, key and scoring verified against the BV work list.",
      "evidence": "https://imslp.org/wiki/List_of_works_by_Ferruccio_Busoni"
    },
    {
      "action": "correct",
      "id": "opus-3d2e81f1f4b726a5",
      "author": "Kurt Weill",
      "oldTitle": "Der neue Orpheus, op. 15",
      "title": "Der neue Orpheus, op. 16",
      "reason": "Uses the critical-edition opus number. Historical editions also used Op.15; this is separate from Der Protagonist.",
      "evidence": "https://www.kwf.org/works/der-neue-orpheus/"
    },
    {
      "action": "correct",
      "id": "opus-d462a49725d85bac",
      "author": "Ferruccio Busoni",
      "oldTitle": "Serenade no. 2 in C major, for clarinet and piano, op. 42",
      "title": "Serenade no. 2, for clarinet and piano, BV108, early op. 42",
      "reason": "Removed the unsupported imported C-major label; the early opus sequence differs from the mature sequence.",
      "evidence": "https://imslp.org/wiki/List_of_works_by_Ferruccio_Busoni"
    }
  ],
  "reviewQueue": [
    {
      "id": "opus-92854fe97c613dcd",
      "title": "Scherzo Op.67",
      "author": "Alexander Scriabin",
      "note": "Scherzo Op.67 conflicts with the documented Op.67 Two Preludes. A Scherzo exists as Op.46, but this row does not identify it securely; not silently reassigned."
    },
    {
      "id": "opus-92f5a84e166c49b1",
      "title": "4 Polish Dances, M60",
      "author": "Karol Szymanowski",
      "note": "Four Polish Dances is documented, but the imported M60 identifier also occurs on another work. Number requires specialist verification."
    },
    {
      "id": "opus-6010fc93bb18c7a8",
      "title": "2 Marches and Polonoises, H.1",
      "author": "Carl Philipp Emanuel Bach",
      "note": "Imported H.1 designation requires verification against the Helm catalogue; not the same work as Wq.53."
    },
    {
      "id": "opus-72a86d61c777bedf",
      "title": "Divertissment no. 1 in E major, for 2 violins, viola, bass, and piano, H.13",
      "author": "John Field",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-fc052f704c4cce23",
      "title": "Divertissment no. 2 in A major, for piano quintet, H.14",
      "author": "John Field",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-64c7cbe0fb36df7c",
      "title": "Piano Concerto no. 2 in B minor, op. 11",
      "author": "César Franck",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-6550267eb4460651",
      "title": "Grande fantasie sur des motifs de Gulistan de Dalayrac, op. 11",
      "author": "César Franck",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-b7712729d7d10041",
      "title": "Grande fantaisie, op. 19",
      "author": "César Franck",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-883cf151dbc28ce7",
      "title": "Pastorale, for organ in E major, op. 19, M.31",
      "author": "César Franck",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-1a7e39d72ffcb523",
      "title": "2 Pieces, op. 13",
      "author": "Edward Elgar",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-7e79b74332e1606a",
      "title": "Gavotte, op. 13, no. 3",
      "author": "Edward Elgar",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-b8bc4463777d29af",
      "title": "6 Mazurkas de salon, for piano, op. 66, B.12",
      "author": "Isaac Albéniz",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-131cad88660021f0",
      "title": "Rhapsodia cubana, op. 66, B.13",
      "author": "Isaac Albéniz",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-d8b5e03c35345252",
      "title": "Chant d'amour, op. 202",
      "author": "Isaac Albéniz",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-fca04203b10bc252",
      "title": "Mallorca, op. 202",
      "author": "Isaac Albéniz",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-244ee0e565f32e71",
      "title": "Duo for 2 Flutes and Piano, op. 43",
      "author": "Ferruccio Busoni",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-5a33a5dbb8455175",
      "title": "Capricho español, op. 39, H.30",
      "author": "Enrique Granados",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-e3fe24bc0749278a",
      "title": "Impromptu, op. 39, H.70",
      "author": "Enrique Granados",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-45d89d25effa35bf",
      "title": "L'Encouragement, op. 34",
      "author": "Fernando Sor",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-8c91ccc96c30aa70",
      "title": "L'encouragement, op. 34, no. 4",
      "author": "Fernando Sor",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-1cb70688b0b17278",
      "title": "Stabat Mater, for soprano, alto, baritone, chorus, and orchestra, op. 53, M60",
      "author": "Karol Szymanowski",
      "note": "Shared catalogue identifier with a different title in the imported source. This may be an opus reuse, part, arrangement, alternate title or source error; retained pending an edition-level check, not automatically merged."
    },
    {
      "id": "opus-d1d156b393a607bc",
      "title": "Trio sonata in G major, B. G1",
      "author": "Giuseppe Tartini",
      "note": "Trio and solo-sonata labels share B.G1 in the source; identity and scoring need an independent thematic-catalogue check."
    },
    {
      "id": "opus-882e691967c07345",
      "title": "O Lady, Leave that Silken Thread, H.4/2",
      "author": "Gustav Holst",
      "note": "Similar text titles but H.4/1 and H.4/2 differ; retained separately pending vocal-scoring and catalogue check."
    },
    {
      "id": "opus-4c4c96b1c1cc5f22",
      "title": "O Lady, Leave That Silken Thread, part-song for unaccompanied mixed chorus, H.4/1",
      "author": "Gustav Holst",
      "note": "Similar text titles but H.4/1 and H.4/2 differ; retained separately pending vocal-scoring and catalogue check."
    },
    {
      "id": "opus-0afab0104b5145a2",
      "title": "Violin Sonata in G major, B. G1",
      "author": "Giuseppe Tartini",
      "note": "Trio and solo-sonata labels share B.G1 in the source; identity and scoring need an independent thematic-catalogue check."
    }
  ]
}