Three dollars and some change

I don't think the 'Your song is ending' bit relates to her (though that would have been really interesting - really, I'm a bit sad because I think it was a *great* story idea, but the execution is lacking. Oh well, that's Moffat for you ;)). They used the Doomsday music behind it (and not the Doctor's theme as many thought), so I would think it realted to that somehow.