The festival, which originates from France, offers a host of brief concerts happening over several days, with an attractive repertoire and cheap tickets.
The Crazy Days are here again, with a long list of events featuring top Polish and international artists.
This year the focus is on the music of Ludwig van Beethoven to mark the 250th anniversary of the composer's birth in a celebration delayed from last year.
Elżbieta Krajewska talked to Janusz Marynowski of the Sinfonia Varsovia orchestra, the driving force behind the festival.
Click on the audio player above to hear the interview.