Haha! brilliant. That combined with the other plausible triplet I'd already worked out to finally clue me the song title, at which point key terms and question drop into place. The title and the second thematic row helped clarify whose version was intended. I now have all the triplets -- wow! they are tortuous. Thanks drxx.
The final grid change, I think, would make more sense to me if the verb for the C was the same as for the K, but maybe there are different versions or I'm just being over-picky. Otherwise, I found this one really tough, but couldn't claim any of it was unfair. It's an elegant final grid, and it's nice to be made to think hard from time to time :-)