On Sundays he had regular meetings with Joseph Bernard, where he also met Maillol and Bissière, with whom he exhibited at Salon d'Automne.

In 1925, after he returned from Paris, his experiences with the work of Georges Braque and Pablo Picasso led Muzika to change his style of painting.

It never let itself to be tempted down the wrong path by briefly fashionable trends or cheaply earned successes; it never got bogged down in the stagnant waters of convention or dissipated in its own discoveries and approaches".

Muzika's wartime period shows the torment and grief of this tragic time with allegorical pictures.

In 1927 he started his work on the book Krásné písmo (a history of Latin script), which was published in 1958 in Czechoslovakia and Schöne Schrift in 1965, in German.

His symbol from the poster is still the logo for Prague Spring International Music Festival (Pražské jaro) today.

[3] Muzika's paintings and drawings are in many Czech and foreign galleries, as well as in the Centre Pompidou, Paris.

(exhibited together with Giorgio de Chirico, Max Ernst, Salvador Dalí, René Magritte)[5] Page with the logo (f or forte) from Muzika's poster adorning the Rudolfinum during the annual festival