Most of our stories about cult musicians who make an album or two and then seem to vanish are framed by grief, despair, and frayed ambition. Not so with Margo Guryan, an ardent jazz anomaly who disdained pop music until hearing “God Only Knows” in 1966, opening a window onto the wonders that form could contain. Only two years later, she released her own set of little pop symphonies, Take a Picture, to great praise and expectation. But, having already divorced the hard-gigging valve trombonist Bob Brookmeyer, she declined to tour or even talk about it all that much, content even if her reticence meant Take a Picture was soon consigned to discount racks and cutout bins. She wrote and recorded for years to come, even collaborating with Neil Diamond’s band, but mostly she seemed satisfied by her relatively private life.