Greatly enjoying Oxford Comma by Vampire Weekend, one of the greatest (and only) songs about an obscure point of punctuation to date. I can see this bunch soundtracking a Wes Anderson movie at some point. Possibly even starring in one. They've got that Yale freshman, Jason Schwatzman thing down.
In fact, I'm wracking my brain to think of other punctuation-related songs. Off the top of my head, I can only think of Ranking Full Stop by The Beat and Message Oblique Speech by Associates. Of course, you could also have anything by Question Mark and the Mysterians. Or Willie Colon. Any more for any more?