Marcelo Koc (4 June 1918 in Vitebsk, Belarus – 26 October 2006 in Buenos Aires) was an Argentinian composer. Koc studied at the Academy of Music in Łódź, Poland and in 1938 went to Buenos Aires where he continued his education with Jacobo Ficher, and Juan Carlos Paz. His œuvre consists of more than 101 works and includes orchestral and concertante works, chamber music, piano and vocal music. Selected works Orchestral Invención a 4 voces (Four-Part Invention), Op. 8 (1948) Preludio, Intermezzo y Fuga for string orchestra, Op. 13 (1951) Divertimento para Orquesta de Vientos (Divertimento for Wind Orchestra), Op 17 (1957) Divertimento para Orquesta de Cuerdas (Divertimento for String Orchestra), Op 17b (1957) 3 Piezas, Op. 18 (1958) Estructuras Líricas, Op. 23 (1966) Núcleos, Op. 25 (1970) Música para cuerdas (Music for Strings), Op. 34 (1986) Tríptico, Op. 45 (1998) Sonoridades, Op. 61 (2000) Tres Momentos Musicales for string orchestra, Op. 63 (2000) Música para Conjunto de Cámara (Music for Chamber Ensemble), Op. 67 (1983) Música 2001 for string orchestra, Op. 74 (2001) Concertante Concerto for violin and orchestra, Op. 26c (1974) Concerto for viola and orchestra, Op. 35 (1986) Concerto for piano and orchestra, Op. 37 (1989) Concerto for viola and orchestra, Op. 40 (1989) Concerto for cello and string orchestra, Op. 41 (1993) Poema Lírico for flute and string orchestra, Op. 47 (1998) Concertino for harpsichord and string orchestra, Op. 62 (2000) Concertino for piano and string orchestra, Op. 65 (2001) Poema Lírico for violin, cello and orchestra, Op. 73 (1997) Canto Spinoza for flute and string orchestra, Op. 75 (2001) Concerto for violin and string orchestra, Op. 79 (1974) Concerto for bass clarinet and orchestra, Op. 80 (1986) Chamber music Preludio for violin and piano, Op. 1 (1945) Sonata for oboe and bassoon, Op. 20 (1960) Quintet for flute, clarinet, violin, cello and piano, Op. 21 (1963) Piano Quintet, Op. 22 (1965) Diálogos for violin and piano, Op. 31 (1979); version for viola and piano (1980) Música para 11 instrumentos (Music for 11 Instruments), Op. 32 (1982) Música para 5 instrumentos (Music for 5 Instruments), Op. 33 (1983) Música para 14 instrumentos (Music for 14 Instruments), Op. 36 (1986) String Quartet No. 2, Op. 42 (1988) Poema Lírico for flute (or violin) and piano, Op. 47b (1998) Piano Trio, Op. 53 (2000) Transparencias for percussion, Op. 58 (2000) Líricas for percussion, Op. 59 (2000) Septet, Op.