For this program, the Brentano quartet has invited six of today’s most imaginative composers to engage with unfinished pieces by Bach, Mozart, Schubert and others to weave compelling new musical works. They will perform the new compositions alongside the original ones to create an exciting evening of dialogue between music of the past and music of our present, 8 p.m., Cummings Arts Center, Evans Hall, tickets: $22; seniors: $20; students: $11, call 860-438-ARTS (2787) or visit http://onstage.conncoll.edu