Nothing now. Finally. Freaked me out for a second there.
Middle of the night... I hear some music. Sounds vaguely familiar. Quiet, distant. I fell back asleep.
Woke up in the morning. Same thing. Shook my head, made sure I was awake. I was. For sure I was hearing music. Couldn't tell where it was coming from despite moving around the room, listening. The music faded before I found anything.
And then again. This time I finally discovered a little music player I left charging. Headphones had popped out. Every once in a while it was playing music. Something's a little off with it and it acts up sometimes. That was getting bizarre though.
Then again, having music play only in your mind now and then might not be so bad.