Rehearsal for the premiere of Alois Haba's Matka, KA at the quarter-tone piano, with Ferdinand Pujman, A. Haba and Frantisek Zelenka, 1931

With Jaroslav Jezek and the Liberated Theatre Orchestra, 1931-33

As a conductor of a Pritomnost concert, 1936

Vaclav Holzknecht, Pavel Borkovec, Isa Krejci, Frantisek Bartos and Jaroslav Jezek, (Manes), Prague, 1930s

The Manes Music Group (Frantisek Bartos, Vaclav Holzknecht, Isa Krejci, Pavel Borkovec, Jaroslav Jezek), Prague, 1937