What do you do when the music won’t leave your head?

It’s been three days since I heard that Chopin nocturne in the cath lab during a quiet moment between cases. Not the piece itself—just the way it played in my mind, like a ghost note. I keep thinking about how the rhythm of a heartbeat can become a melody if you listen long enough. What’s the last thing that stayed with you like that? Something you didn’t expect to carry.