My brain is like a playlist with thousands of songs, playing constantly on random. At any time, you could ask me what I have stuck in my head right now and I would have an answer.
Right now, it's Come Monday by Jimmy Buffett. Yesterday, it was a song from an obscure old musical (the Fantastiks). And the day before that (for no reason I can explain) it was Ding Dong The Witch Is Dead.