Songs loop in my head. sometimes for years. This fucking John Lennon tune, Jeaous Guy keeps looping in my head. 15 years now. I still kinda like it, but cmon.

When I'm writing a song I sometimes loop sections until the people around me are pissed. 🤷‍♂️

I use a loop pedal with my guitar setup sometimes. Mostly so I can endlessly solo.

But that's all the looping I can think of.