What’s the last song you re-listened to obsessively?

I’ve been stuck on this old folk tune from a busker in Lisbon—just two chords, but something about the way the wind caught the singer’s voice that afternoon made it stick. It’s not even a great recording. But I played it 47 times yesterday while setting up my corner near the bridge. What’s your version of that? Not the ‘best’ song—just the one that sneaks back in when you’re not looking.