the ingrid revolution

Hours before her album-release show at Joe’s Pub on Tuesday night, Ingrid Michaelson was in the back of an ambulance, speeding toward the emergency room. The incident — a false alarm, as she described it onstage — had involved heart palpitations, a mounting panic and some awkward embarrassment. But what if her “near-death experience,” as she wryly put it, had yielded a musical epiphany? “What if I came up here and started doing, like, freestyle jazz?” she asked, before delivering an impromptu-sounding gag song with her guitar. Then, laughing: “ ‘Grey’s Anatomy’ will not like that one.”