The Wainwrights are the most prolific multi-generational musical family this side of the Carters and the Guthries. And those families never made their own travails quite so voyeuristic: listening to the Wainwrights is a bit like watching a whole season of Six Feet Under in one sitting. Martha’s brother is Rufus, her father is Loudon III, her mother and aunt are Kate and Anna McGarrigle. You can hear the family resemblance in Martha’s sweet supper club number “How Soon” Martha’s melancholy is almost uplifting. But the languid, atmospheric hum of “I Will Internalize” is proof of a student who has moved beyond simply parroting her teachers. And “BMFA,” whose acronym of a title we’ll let you figure out for yourself (and which she’s dedicated to her father in concert), is the most alluring piece of profanity since Liz Phair traded in her diary for a gold lamé tube top and designer jeans. Let’s hope Martha keeps her current pants on.