Most Helpful Guy
I pretty much always have a song running through my head. Either it's a song I made up, am currently making up, or a song I really like/find catchy.
It sometimes drives me nuts though, because I'll get a song stuck on my mind, and I'll try to tap it out or think of how it is played. If I don't remember the song completely, I get irritiable until I go and listen to it xD1