Yeah, song lyrics are tricky. They can be really significant all on their own, personally or culturally or both, even, so you're always risking weird associations when you use them. Ditto for poems, I guess. China Shop's movie title theft is better, for that reason--there doesn't usually seem to be a lot of emotional weight attached to those--but then you do risk being mis-googled. *g*

I can never do summaries, either, so title-as-summary is even more daunting for me. But that seems like sound advice for people who like them.