The Parrish Art Museum in Water Mill will screen “Four American Composers: John Cage” tomorrow at 6 p.m. An excerpt from Peter Greenaway’s 1983 documentary “Four American Composers,” it profiles the avant-garde composer, writer, and artist whose influence has been felt in the visual arts and dance, as well as by composers and musicians ranging from Stockhausen to Morton Feldman to Philip Glass to Frank Zappa.