Kapr studied at the Prague Conservatory with Jaroslav Řídký and Jaroslav Křička. From 1939 to 1946 he worked as a music editor at Radio Prague. From 1950 to 1952 he was editor in chief of the state music publishing house Orlik, 1961-1970 teacher of composition at the Janáček Academy of Music and Performing Arts in Brno. He then worked as a freelance composer in Prague.
He composed an opera, a ballet, ten symphonies, a symphonic poem, an orchestral suite, two piano concertos and a violin concerto, several works chamber musician, piano sonatas, a cantata, choir music, songs and film scores.
- Biography and works on www.musica.cz
- Jindřiška Bártová: Jan Kapr, Nastin života a Dila. JAMU, Brno 1994, ISBN 80-8542913-6, ( Acta et musicologica theatrologica 1).