It never stops. Day, night, middle of night, half asleep. Doesn't matter.

They will last days (sometimes weeks) on end, only to be replaced (or joined) by another. I don't care when it's music I like, but all too often it's stuff I can't stand.
Often, there is more than one song playing simultaneously.

All jumbled together with thoughts jumping around or looping. It's very noisy up there.