I pretty much always have a song playing in my head. Normally, the songs rotate pretty frequently, except for two cases: if I’ve listened to the same music repeatedly (which I tend to do with new CDs) or, I just remembered, when I’m singing in a choir.
Occasionally, I overdose on a new CD and get really tired of the song(s) in my head. If I stop listening to that music, the song will eventually change to something else.

But now that I’ve started singing in a church choir again, I remember that there’s a different dynamic to the songs that get stuck in my head. Rehearsing and performing a choral piece seems to lodge music more firmly in my head than just listening to it (which makes sense). I’ve had last Sunday’s anthem replaying all week–and I didn’t really like it in the first place! Maybe it’ll be replaced after Wednesday night’s rehearsal. I hope so, because I’m REALLY tired of it.