I hated "The Little Drummer Boy" for many years: I had to sing the low part in choir, which consisted of going "rrum...rrum...rrum..." for four minutes. It's incredibly boring to do.

What cured me of hating it: the nifty version by Mannheim Steamroller, which has the interesting quality of beginning electronic and gradually becoming acoustic.

I still don't want to sing the low part, though.