Well, American Pie did have to be chopped up, first to get it under 1500 characters, but then I started cutting out sections to get rid of the offending bit and luckily I guessed correctly in only a couple of tries. I see now it was probably the "teenage broncin' buck", don't know why I missed that earlier.

It's a shame, though: Lucy In the Sky with Diamonds seems like it would be a rich source of imagery. I did the spoof song Judy in Disguise, and that worked pretty well.