So, the day before yesterday I had a line from a song I cdn't identify stuck in my head all evening. Usually with such things I just have to give it time and over the course of a day or so the snippet will stretch to include a few words or notes to either side of the bit I have. This time it didn't seem to be making any progress, so before the morning was over I'd typed in the line I had and Google's lyrics-searching did the rest.
For the record, the line was
does your head ever give you trouble
And, for those who want to guess it on their own, I've moved the answer to comments.
--current listening: that song and also THE CONCERT FOR BANGLA DESH, which I'd never heard until last week. Essentially a live version of George Harrison's ALL THINGS MUST PASS, the high water mark of his solo career.