The works of the Czech composer Alois Hába consists of 103 opuses, with the majority of the compositions being various kinds of chamber music pieces, predominantly for piano or strings. The most important works include his String quartets, which document and demonstrate the development of the composer's style (microtonal music and his most innovative opera: "Matka" (Mother). Hába's first microtonal composition is Suite, op.1a from 1918, his earliest published mictrotonal piece is the 2nd Quartet (1920) and his last was the 16th Quartet from 1967.
Note that 'semitone' refers to the usual 12-tET scale, 'quarter-tone' refers to 24-tET, '5th-tone' refers to 31-tET (not 30-tET), '6th-tone' refers to 36-tET, '12-tone' refers to Schoenberg's '12-tone method'.
Piano works Op. 1a, Suite (3 fugues) for piano (1918) Op. 1b, Variations for piano on a canon of Robert Schumann (1914–15, * 1918) Op. 2, 2 Sketches for piano Op. 3, Sonata for piano Op. 6, 6 piano pieces (1920) Op. 10, 1st Suite for quarter-tone piano (revised 1932 as op. 11a), 1922 Op. 11, 2nd Suite for quarter-tone piano (revised 1932 as op. 11b), 1922 Op. 16, 3rd Suite for quarter-tone piano (1923) Op. 17, 1st Fantasy for quarter-tone piano (1923) Op. 19, 2nd Fantasy for quarter-tone piano (1924) Op. 20, 3rd Fantasy for quarter-tone piano (1924) Op. 22, 4th Suite for quarter-tone piano (1925) Op. 23, 5th Suite for quarter-tone piano (1925) Op. 25, 4th Fantasy for quarter-tone piano (1925) Op. 26, 5th Fantasy for quarter-tone piano (1925) Op. 27, 6th Fantasy for quarter-tone piano (1926) Op. 28, 7th Fantasy for quarter-tone piano (1926) Op. 29, 8th Fantasy for quarter-tone piano (1926) Op. 30, 9th Fantasy for quarter-tone piano (1926) Op. 31, 10th Fantasy for quarter-tone piano (1926) Op. 38, Toccata quasi una Fantasia (semitone piano), 1931 Op. 39, 4 Modern Dances for piano (1927-1931) Op. 62, Sonata for quarter-tone piano (1946–47) Op. 88, Suite Nr. 6 (quarter-tone piano), 1957–59 Op. 90, 12th String Quartet (quarter-tone), 1959–60 Op.102, 6 Moods for piano (1971)
Vocal works Op. 13, Vocal-suite in quarter-tones (choir), 1922 Op. 35, Matka (Mother), quarter-tone opera in 10 scenes (1927–28) Op. 36, Já (Me) - quarter-tone men's choir Op. 42, 5 Choruses (3 quarter-tone boy's or women's voices), 1932 Op. 43, Children's Play (quarter-tone children's voices, soli and choir), 1932 Op. 44, 5 Mixed Choruses (quarter-tone choir) Op. 45, Pracující den (The working day), 10 quarter-tone men's choruses (1932) Op. 46, Cesta života (The Path of Life), symphonic fantasy for orchestra & Mass Songs for choir (1933) Op. 47, Nová země (The New Earth), 12-tone opera in 3 acts & 6 scenes (1934–36) Op. 48, Children's rhymes (medium voice & piano), 1936 Op. 50, Přijď království Tvé (Thy Kingdom Come), 6th-tone musical drama in 7 scenes, 1937–42 Op. 51, Dětské nálady (Children's Moods), 8-song cycle (middle voice & quarter-tone guitar), 1943 Op. 53, Poesie života (Poetry of Life), 12-song cycle (soprano & quarter-tone guitar), 1943 Op. 57, Milenci (The Lovers), 7-song cycle (soprano & piano), 1944 Op. 58, 5 Moravian Love-songs (mezzo-soprano, guitar or piano accompaniment), 1944 Op. 64, Ústava 9. května (Constitution of May 9) for men's choir (1948) Op. 65, 3 Men's Choruses (1948) Op. 66, Meditace (Meditation) for men's choir (1948) Op. 67, Mír (Peace) for men's choir (1948) Op.67a, Soviet Songs (choir), 1948 & Mass Songs (choir), 1948-50 Op. 68, Za mír (For Peace), cantata (choir & orchestra), 1949 Op. 71, 3 Men's Choruses (1950) Op. 84, Slovanské mudrosloví (Slavic Proverbs) for boy's or women's choir & piano (1945–55) Op.99a, Praha (Prague) for choir, 1968 Op.101, Poznámky z deníku (Diary-notes), melodrama for speaker & string-quartet (1970)
Chamber works Op. 1, Sonata for violin and piano (1914–15) Op. 4, String Quartet 1 (semitone), 1919 Op. 7, String Quartet 2 (quarter-tone), 1920 Op. 9a, Fantasy in quarter-tones for violin solo (1921) Op. 9b, Music in quarter-tones for violin solo (1922) Op. 12, 3rd String Quartet (quarter-tone), 1922 Op. 14, 4th String Quartet (quarter-tone), 1922 Op. 15, 5th String Quartet (Hába's 1st 6th-tone composition), 1923 Op. 18, Fantasy in quarter-tones for cello solo (1924) Op. 21, Fantasy for violin & quarter-tone piano (1925) Op. 24, 1st Suite for quarter-tone clarinet & quarter-tone piano (1925) Op. 32, Fantasy for viola & quarter-tone piano (1926) Op. 33, Fantasy for cello & quarter-tone piano (1927) Op.34a, Fantasy for flute (or violin) & piano (1927–28) Op.34b, Suite (arr. J. Horák) (bass-clarinet & piano) 1927-28 Op. 40, Fantasy for Nonet Nr. 1 (12-tone), 1931 Op. 41, Fantasy for Nonet Nr. 2 (7-tone), 1932 Op. 49, Duo for 6th-tone violins (1937) Op. 52, Sonata for guitar (1943) Op. 54, 1st Suite for quarter-tone guitar (1943) Op. 55, 2nd Suite for quarter-tone clarinet (solo), 1943 Op. 56, Suite for quarter-tone trumpet & trombone (1944) Op. 59, Sonata for Chromatic Harp (1944) Op. 60, Sonata for Diatonic Harp (1944) Op. 61, Intermezzo and Praeludium for diatonic harp (1944–45) Op. 63, 2nd Suite for quarter-tone guitar (1947)* Op. 69, Suite for bassoon solo (1950) Op. 70, 6th String Quartet (quarter-tone), 1950 Op. 72, Suite in quarter-tones for 4 trombones (1950) Op. 73, 7th String Quartet "Christmas" (semitone), 1950–51 Op. 74, Quartet for 4 bassoons (1951) Op.75c, 6 Polish Folksongs for harp (1951) Op. 76, 8th String Quartet (semitone), 1951 Op. 78, Sonata for clarinet (solo), 1951 Op. 79, 9th String Quartet (semitone), 1951 Op. 80, 10th String Quartet (6th-tone), 1951 Op.81a, Suite for violin solo (1955) Op.81b, Suite for cello solo (1955) Op. 82, 3rd Nonet (1953–55) Op.85a, Suite in 6th-tones for violin solo (1955) Op.85b, Suite in 6th-tones for cello solo (1955) Op. 87, 11th String Quartet (6th-tone), 1957–58 Op. 90, 12th String Quartet (quarter-tone), 1959–60 Op. 91, Suite for dulcimer (1960) Op. 92, 13th String Quartet (semitone), 1961 Op. 93, Suite in quarter-tones for violin (1961–62) Op. 94, 14th String Quartet (quarter-tone), 1963 Op. 95, 15th String Quartet (semitone), 1964 Op. 96, Suite for bass-clarinet (1965) Op. 97, 4th Nonet (1967-1971) Op. 98, 16th String Quartet (5th-tone), 1967 Op. 99, Suite for saxophone solo (1968) Op.100, Suite for bass-clarinet with piano (1969) Op.103, Suite for violin & piano (1972)
By opus number Op. 1, Sonata for violin and piano (1914–15) Op. 1a, Suite (3 fugues) for piano (1918) Op. 1b, Variations for piano on a canon of Robert Schumann (1914–15, * 1918) Op. 2, 2 Sketches for piano Op. 3, Sonata for piano Op. 4, String Quartet 1 (semitone), 1919 Op. 5, Overture for orchestra Op. 6, 6 piano pieces (1920) Op. 7, String Quartet 2 (quarter-tone), 1920 Op. 8, Symphonic Fantasy for piano & orchestra (1920-1921) Op. 9a, Fantasy in quarter-tones for violin solo (1921) Op. 9b, Music in quarter-tones for violin solo (1922) Op. 10, 1st Suite for quarter-tone piano (revised 1932 as op. 11a), 1922 Op. 11, 2nd Suite for quarter-tone piano (revised 1932 as op. 11b), 1922 Op. 12, 3rd String Quartet (quarter-tone), 1922 Op. 13, Vocal-suite in quarter-tones (choir), 1922 Op. 14, 4th String Quartet (quarter-tone), 1922 Op. 15, 5th String Quartet (Hába's 1st 6th-tone composition), 1923 Op. 16, 3rd Suite for quarter-tone piano (1923) Op. 17, 1st Fantasy for quarter-tone piano (1923) Op. 18, Fantasy in quarter-tones for cello solo (1924) Op. 19, 2nd Fantasy for quarter-tone piano (1924) Op. 20, 3rd Fantasy for quarter-tone piano (1924) Op. 21, Fantasy for violin & quarter-tone piano (1925) Op. 22, 4th Suite for quarter-tone piano (1925) Op. 23, 5th Suite for quarter-tone piano (1925) Op. 24, 1st Suite for quarter-tone clarinet & quarter-tone piano (1925) Op. 25, 4th Fantasy for quarter-tone piano (1925) Op. 26, 5th Fantasy for quarter-tone piano (1925) Op. 27, 6th Fantasy for quarter-tone piano (1926) Op. 28, 7th Fantasy for quarter-tone piano (1926) Op. 29, 8th Fantasy for quarter-tone piano (1926) Op. 30, 9th Fantasy for quarter-tone piano (1926) Op. 31, 10th Fantasy for quarter-tone piano (1926) Op. 32, Fantasy for viola & quarter-tone piano (1926) Op. 33, Fantasy for cello & quarter-tone piano (1927) Op.34a, Fantasy for flute (or violin) & piano (1927–28) Op.34b, Suite (arr. J. Horák) (bass-clarinet & piano) 1927-28 Op. 35, Matka (Mother), quarter-tone opera in 10 scenes (1927–28) Op. 36, Já (Me) - quarter-tone men's choir (1928) Op. 37, 6 Pieces for 6th-tone harmonium or string quartet (1928) Op. 38, Toccata quasi una Fantasia (semitone piano), 1931 Op. 39, 4 Modern Dances for piano (1927-1931) Op. 40, Fantasy for Nonet Nr. 1 (12-tone), 1931 Op. 41, Fantasy for Nonet Nr. 2 (7-tone), 1932 Op. 42, 5 Choruses (3 quarter-tone boy's or women's voices), 1932 Op. 43, Children's Play (quarter-tone children's voices, soli and choir), 1932 Op. 44, 5 Mixed Choruses (quarter-tone choir) Op. 45, Pracující den (The working day), 10 quarter-tone men's choruses (1932) Op. 46, Cesta života (The Path of Life), symphonic fantasy for orchestra & Mass Songs for choir (1933) Op. 47, Nová země (The New Earth), 12-tone opera in 3 acts & 6 scenes (1934–36) Op. 48, Children's rhymes (medium voice & piano), 1936 Op. 49, Duo for 6th-tone violins (1937) Op. 50, Přijď království Tvé (Thy Kingdom Come), 6th-tone musical drama in 7 scenes, 1937–42 Op. 51, Dětské nálady (Children's Moods), 8-song cycle (middle voice & quarter-tone guitar), 1943 Op. 52, Sonata for guitar (1943) Op. 53, Poesie života (Poetry of Life), 12-song cycle (soprano & quarter-tone guitar), 1943 Op. 54, 1st Suite for quarter-tone guitar (1943) Op. 55, 2nd Suite for quarter-tone clarinet (solo), 1943 Op. 56, Suite for quarter-tone trumpet & trombone (1944) Op. 57, Milenci (The Lovers), 7-song cycle (soprano & piano), 1944 Op. 58, 5 Moravian Love-songs (mezzo-soprano, guitar or piano accompaniment), 1944 Op. 59, Sonata for Chromatic Harp (1944) Op. 60, Sonata for Diatonic Harp (1944) Op. 61, Intermezzo and Praeludium for diatonic harp (1944–45) Op. 62, Sonata for quarter-tone piano (1946–47) Op. 63, 2nd Suite for quarter-tone guitar (1947) Op. 64, Ústava 9. května (Constitution of May 9) for men's choir (1948) Op. 65, 3 Men's Choruses (1948) Op. 66, Meditace (Meditation) for men's choir (1948) Op. 67, Mír (Peace) for men's choir (1948) Op.67a, Soviet Songs (choir), 1948 & Mass Songs (choir), 1948-50 Op. 68, Za mír (For Peace), cantata (choir & orchestra), 1949 Op. 69, Suite for bassoon solo (1950) Op. 70, 6th String Quartet (quarter-tone), 1950 Op. 71, 3 Men's Choruses (1950) Op. 72, Suite in quarter-tones for 4 trombones (1950) Op. 73, 7th String Quartet "Christmas" (semitone), 1950–51 Op. 74, Quartet for 4 bassoons (1951) Op.75a, Fantasy for organ (1951) Op.75b, Fantasy and Fugue "HABA" for organ (1951) Op.75c, 6 Polish Folksongs for harp (1951) Op. 76, 8th String Quartet (semitone), 1951 Op. 77, Valašská suita (Wallachian Suite) for orchestra, 1951–53 Op. 78, Sonata for clarinet (solo), 1951 Op. 79, 9th String Quartet (semitone), 1951 Op. 80, 10th String Quartet (6th-tone), 1951 Op.81a, Suite for violin solo (1955) Op.81b, Suite for cello solo (1955) Op. 82, 3rd Nonet (1953–55) Op. 83, Violin Concerto (1954–55) Op. 84, Slovanské mudrosloví (Slavic Proverbs) for boy's or women's choir & piano (1945–55) Op.85a, Suite in 6th-tones for violin solo (1955) Op.85b, Suite in 6th-tones for cello solo (1955) Op. 86, Viola Concerto (1955–57) Op. 87, 11th String Quartet (6th-tone), 1957–58 Op. 88, Suite Nr. 6 (quarter-tone piano), 1957–59 Op. 89, Fantasy Nr. 11 (quarter-tone piano), 1959 Op. 90, 12th String Quartet (quarter-tone), 1959–60 Op. 91, Suite for dulcimer (1960) Op. 92, 13th String Quartet (semitone), 1961 Op. 93, Suite in quarter-tones for violin (1961–62) Op. 94, 14th String Quartet (quarter-tone), 1963