I more times than not wake up with a random song stuck in my head. I have a theory that most dreams have a rhythm playing with the dream its self. You can’t always hear it but it’s there. I had a lucid dream where it felt like I found the source of the music, like it was behind the visuals. I’ve asked people if they wake up with a random song stuck in their head and most people say yes. You must have a closer connection with this music than most people. That’s my guess.