In 2012, Barbra Streisand took an initial look in her vault and rediscovered handfuls of old tapes with songs she’d recovered over her six-decades-plus in show business but never released for one reason or another. It turns out that even after Release Me, she still had more in the…

Barbra Streisand performs at SAP Center in San Jose on Aug. 4, 2016. Photo: Nick Buckmaster. SAN JOSE — The title theme for Barbra Streisand’s concert Thursday night was a literal one. “The Music … The Mem’ries … The Magic” rang true, celebrating the star’s six decades of No.…