Chamber Music Northwest’s Summer Festival continues with a special Fourth of July program celebrating five American composers – William Bolcom, John Corigliano, John Harbison, Joan Tower and Charles Wuorinen– all of whom turn 75 this year. Among the performers will be Bolcom himself, at the piano, along with his wife, mezzo-soprano Joan Morris. The 8 p.m. performance is preceded at 7:30 by a musical conversation. July 4 at Reed College. Reserve tickets at the CMNW website.