BB refers to the numbering within László Somfai’s forthcoming catalog of Bartók’s works.
See Somfai, Béla Bartók: Composition, Concepts, and Autograph Sources
(Berkeley, CA: University of California Press, 1996), 297ff.
| BB 1 | Early piano pieces, opp. 1–31 [first opus numbering] | 1890–1894 |
| BB 2a | Sonata No. 1 for piano (G minor), op. 1 [second opus numbering] | 1894 |
| BB 2b | Scherzo (G minor), for piano | 1894 |
| BB 3 | Fantasia for piano (A minor), op. 2 | 1895 |
| BB 4 | Sonata No. 2 for piano (F major), op. 3 | 1895 |
| BB 5 | Capriccio for piano (B minor), op. 4 | 1895 |
| BB 6 | Sonata for Violin and Piano (C minor), op. 5 | 1895 |
| BB 7 | (Lost works, opp. 6–12) | 1895–1897 |
| BB 8 | Drei Klavierstücke, op. 13 | 1897 |
| BB 9 | (Lost works, opp. 14–16) | 1897 |
| BB 10 | Sonata for Violin and Piano (A major), op. 17 | 1897 |
| BB 11 | Scherzo oder Fantasie for piano (B major), op. 18 | 1897 |
| BB 12 | Sonata for piano (A flat major), op. 19 (“op. 1”) | 1898 |
| BB 13 | Piano Quartet (C minor), op. 20 | 1898 |
| BB 14 | Drei Klavierstücke, op. 21 (“op. 5”) | 1898 |
| BB 15 | Drei Lieder for voice and piano | 1898 |
| BB 16 | Scherzo for piano (B minor) | 1898 |
| BB 17 | String Quartet (F major) | 1898 |
| BB 18 | Tiefblaue Veilchen for voice and orchestra | 1899 |
| BB 19 | Studies in composition | 1899–1901 |
| BB 20 | Liebeslieder for voice and piano | 1900 |
| BB 21 | Scherzo (F.F.B.B.) for piano | 1900 |
| BB 22 | Variations for piano | 1900–1901 |
| BB 23 | Tempo di minuet for piano | 1901 |
| BB 24 | Four Songs to Texts by Lajos Pósa for voice and piano | 1902 |
| BB 25 | Symphony for orchestra (fragment) | 1902 |
| BB 26a | Duo for two violins | 1902 |
| BB 26b | Andante (A-dúr) for violin and piano | 1902 |
| BB 27 | Four Piano Pieces | 1903 |
| BB 28 | Sonata for Violin and Piano | 1903 |
| BB 29 | Evening for voice and piano | 1903 |
| BB 30 | Evening for men’s voices | 1903 |
| BB 31 | Kossuth Symphonic Poem for orchestra | 1903 |
| BB 31 | Marche funèbre for piano | 1903 |
| BB 32 | Four Songs for voice and piano (lost) | 1903 |
| BB 33 | Piano Quintet | 1903–1904 |
| BB 34 | Székely Folk Song for voice and piano | 1904 |
| BB 35 | Scherzo for orchestra and piano, op. 2 [final opus numbering] | 1904 |
| BB 35 | Scherzo for orchestra and piano, op. 2, reduction for two pianos | |
| BB 36a | Rhapsody for piano, op. 1 | 1904 |
| BB 36b | Rhapsody for piano and orchestra, op. 1 | 1905 |
| BB 36b | Rhapsody for piano and orchestra, op. 1, reduction for two pianos | |
| BB 37 | Hungarian Folk Songs for voice and piano, Series I | c1904–1905 |
| BB 38 | Petits morceaux for piano | 1905 |
| BB 39 | Suite No. 1 for orchestra, op. 3 | 1905 |
| BB 40 | Suite No. 2 for orchestra, op. 4 | 1905–1907 |
| BB 41 | Children’s Songs for voice and piano | 1905 |
| BB 42 | Hungarian Folk Songs for voice and piano, Nos. 1–10 | 1906 |
| BB 43 | Hungarian Folk Songs for voice and piano, Series II | 1906–1907 |
| BB 44 | Two Hungarian Folk Songs for voice and piano | 1907 |
| BB 45a | From Gyergyó for recorder and piano | 1907 |
| BB 45b | Three Hungarian Folk Songs from Csík for piano | 1907 |
| BB 46 | Four Slovak Folk Songs for voice and piano | c1907 |
| BB 47 | Eight Hungarian Folk Songs for voice and piano | 1907, 1917 |
| BB 48a | Violin Concerto (No. 1) | 1907–1908 |
| BB 48a | Violin Concerto (No. 1), piano reduction | |
| BB 48b | Two Portraits for orchestra, op. 5 | 1907–1911 |
| BB 49 | Two Elegies for piano, op. 8b | 1908–1909 |
| BB 50 | Fourteen Bagatelles for piano, op. 6 | 1908 |
| BB 51 | Ten Easy Piano Pieces | 1908 |
| BB 52 | String Quartet No. 1, op. 7 | 1908–1909 |
| BB 53 | For Children for piano | 1908–1910 |
| BB 53add | Béla Bartók–Joseph Szigeti: Hungarian Folk Tunes for violin and piano | 1926 |
| BB 54 | Seven Sketches for piano, op. 9b | 1908–1910 |
| BB 55 | Three Burlesques for piano, op. 8c | 1908–1911 |
| BB 56 | Two Romanian Dances for piano, op. 8a | 1909–1910 |
| BB 57 | Two Romanian Folk Songs for women’s voices | 1909? |
| BB 58 | Four Dirges for piano, op. 9a | c1909–1910 |
| BB 59 | Two Pictures for orchestra, op. 10 | 1910 |
| BB 59 | Two Pictures for orchestra, op. 10, piano reduction | |
| BB 60 | Four Old Hungarian Folk Songs for men’s voices | 1910, rev. 1926 |
| BB 61 | Romanian Dance for orchestra | 1911 |
| BB 62 | Duke Bluebeard’s Castle, op. 11 | 1911 |
| BB 62 | Duke Bluebeard’s Castle, op. 11, vocal-piano score | 1911 |
| BB 63 | Allegro barbaro for piano | 1911 |
| BB 64 | Four Orchestral Pieces, op. 12 | 1912, 1921 |
| BB 65 | Nine Romanian Folk Songs for voice and piano | c1912 |
| BB 66 | Béla Bartók–Sándor Reschofsky: Piano Method | 1913 |
| BB 66 | The First Term at the Piano | 1929 |
| BB 67 | Romanian Christmas Songs for piano | 1915 |
| BB 68 | Romanian Folk Dances for piano | 1915 |
| BB 69 | Sonatina for piano | 1915 |
| BB 70 | Suite for piano, op. 14 | 1916 |
| BB 71 | Five Songs for voice and piano, op. 15 | 1916 |
| BB 72 | Five Songs to Texts by Endre Ady for voice and piano, op. 16 | 1916 |
| BB 73 | Slovak Folk Song for voice and piano | 1916 |
| BB 74 | The Wooden Prince, op. 13 | 1914–1917 |
| BB 74 | The Wooden Prince, op. 13, piano reduction | |
| BB 75 | String Quartet No. 2, op. 17 | 1914–1917 |
| BB 76 | Romanian Folk Dances for small orchestra | 1917 |
| BB 77 | Four Slovak Folk Songs for mixed voices and piano accompaniment | 1916 |
| BB 78 | Slovak Folk Songs for four-part men’s chorus | 1917 |
| BB 79 | Fifteen Hungarian Peasant Songs for piano | 1914–1918 |
| BB 80a | “Leszállott a páva” for piano | 1914 |
| BB 80b | Three Hungarian Folk Tunes for piano | 1914–1918, rev. 1941 |
| BB 81 | Studies for piano, op. 18 | 1918 |
| BB 82 | The Miraculous Mandarin, op. 19 | 1918–1919, 1924 |
| BB 82 | The Miraculous Mandarin, op. 19, piano reduction | 1923–1924 |
| BB 83 | Improvisations on Hungarian Peasant Songs for piano, op. 20 | 1920 |
| BB 84 | Sonata for Violin and Piano No. 1 | 1921 |
| BB 85 | Sonata for Violin and Piano No. 2 | 1922 |
| BB 86 | Dance Suite for orchestra | 1923 |
| BB 86 | Dance Suite for orchestra, version for piano solo | 1925 |
| BB 87a | Five Village Scenes for a female voice and piano | 1924 |
| BB 87b | Three Village Scenes for 4 or 8 female voices and chamber orchestra | 1926 |
| BB 87b | Three Village Scenes for 4 or 8 female voices and chamber orchestra, vocal-piano score | |
| BB 88 | Sonata for piano | 1926 |
| BB 89 | Out of Doors. Five Piano Pieces | 1926 |
| BB 90 | Nine Little Piano Pieces | 1926 |
| BB 91 | Piano Concerto No. 1 | 1926 |
| BB 91 | Piano Concerto No. 1, reduction for two pianos | |
| BB 92 | Three Rondos on Folk Tunes for piano | 1916–1927 |
| BB 93 | String Quartet No. 3 | 1927 |
| BB 94a | Rhapsody No. 1 for violin and piano | 1928 |
| BB 94b | Rhapsody No. 1 for violin and orchestra | 1928–1929 |
| BB 94c | Rhapsody No. 1 for violoncello and piano | 1928–1929 |
| BB 95 | String Quartet No. 4 | 1928 |
| BB 96a | Rhapsody No. 2 for violin and piano | 1928, rev. 1935 |
| BB 96b | Rhapsody No. 2 for violin and orchestra | 1928–1929, rev. 1935 |
| BB 97 | Five Hungarian Folk Songs for voice and piano | 1928 |
| BB 98 | Twenty Hungarian Folk Songs for voice and piano | 1929 |
| BB 99 | Hungarian Folk Songs for mixed voices | 1930 |
| BB 100 | Cantata profana for tenor, baritone, double chorus, and orchestra | 1930 |
| BB 100 | Cantata profana for tenor, baritone, double chorus, and orchestra, vocal-piano score | |
| BB 101 | Piano Concerto No. 2 | 1930–1931 |
| BB 101 | Piano Concerto No. 2, reduction for two pianos | |
| BB 102a | Béla Bartók–Endre Gertler: Sonatina for violin and piano | c1930 |
| BB 102b | Dances from Transylvania for orchestra | 1931 |
| BB 103 | Hungarian Sketches for orchestra | 1931 |
| BB 104 | Forty-four Duos for two violins | 1931–1932 |
| BB 105 | Mikrokosmos for piano | 1926, 1932–1939 |
| BB 106 | Székely Folk Songs for men’s voices | 1932 |
| BB 107 | Hungarian Peasant Songs for orchestra | 1933 |
| BB 108 | Five Hungarian Folk Songs for voice and orchestra | 1933 |
| BB 109 | Béla Bartók–Tivadar Országh: Hungarian Folk Songs for violin and piano | 1934 |
| BB 110 | String Quartet No. 5 | 1934 |
| BB 111a | Twenty-Seven Two- and Three-Part Choruses for children’s and women’s voices | 1935–1936 |
| BB 111b | Seven Choruses with Orchestra | 1937–1941 |
| BB 112 | From Olden Times for men’s voices | 1935 |
| BB 113 | Petite Suite for piano | 1936 |
| BB 114 | Music for Strings, Percussion, and Celesta | 1936 |
| BB 115 | Sonata for Two Pianos and Percussion | 1937 |
| BB 116 | Contrasts for violin, clarinet, and piano | 1938 |
| BB 117 | Violin Concerto (No. 2) | 1937–1938 |
| BB 117 | Violin Concerto (No. 2), piano reduction | |
| BB 118 | Divertimento for string orchestra | 1939 |
| BB 119 | String Quartet No. 6 | 1939 |
| BB 120 | Seven Pieces from Mikrokosmos for two pianos | 1940 |
| BB 121 | Concerto for Two Pianos and Orchestra | 1940 |
| BB 122 | Suite for Two Pianos, op. 4b | 1941 |
| BB 123 | Concerto for Orchestra | 1943 |
| BB 123 | Concerto for Orchestra, piano reduction | 1944 |
| BB 124 | Sonata for Solo Violin | 1944 |
| BB 125 | The Husband’s Lament (Goat Song) for voice and piano | 1945 |
| BB 126 | Three Ukrainian Folk Songs for voice and piano | 1945? |
| BB 127 | Piano Concerto No. 3 | 1945 |
| BB 128 | Viola Concerto | 1945 |