Mary Timony’s Ren-Faire grunge shtick has always looked effortless. Since she came into her own with Helium in the mid-90s and through a number of incarnations of the Mary Timony Band since, she has documented her travels through a Xanax-tinged Xanadu, weaving dark power pop and magical narratives. It’s only when she shares the stage that it’s apparent how much work it takes to sound so indifferent. After a burnout period following some struggles…