The forecast calls for the heat wave to break tomorrow, which means nobody will need to suffer for art to attend the free Thursday-evening concert by Chicago experimental-music collective Aperiodic on Oak Street Beach. Led by composer Nomi Epstein, the ensemble is performing an hour-long version of the wonderful Swell Piece (1967) by composer James Tenney at 7 PM as part of Make Music Chicago. The 15 or so players will include folks from a wide variety of musical communities, such as Joseph Clayton Mills of Haptic, Ammie Brod of Ensemble Dal Niente, and improvising bassoonist Katherine Young.