Steven Brinberg masters not just Barbra Streisand’s mannerisms but her entire manner—the mixture of soft-spoken entitlement and awkward preening that typifies this funny girl turned self-serious artiste. And Brinberg’s pseudo soprano is the next best thing to Streisand herself; he has a voice like I Can’t Believe It’s Not Butter. Tonight he celebrates the diva's long collaboration with the late Marvin Hamlisch.