Why Do I Wake up with a Song in My Head?

I have woken up to a song in my head most mornings for as long as I can remember. Recently I have started trying to find the song on Rhapsody and listening to it as soon as possible after waking up. I will sometimes post what I am listening to on Twitter to keep a record of the songs. These are not always songs I would typically listen to or that I remember hearing recently. I don't know an explanation as to how or why my subconscious picked the song for that day. I am not a follower of dream interpretation nor do I believe that dreams necessarily have a deeper meaning. I subscribe to the belief that dreams are just the noise the mind makes while it is downloading all the information it has been subjected to over the course of the day. I do not usually remember my dreams more than a few minutes after I wake up, but I do remember the music my mind plays. Sometimes it will stay with me through the day. I will consider myself lucky that my mind acts like an ipod on shuffle playing me random music to start my day. It is probably pointless to try to figure our why it chooses the songs it does. I would most likely be disappointed if I knew the answer. I will just enjoy the music if it is music I enjoy. If not, I will play some music I do like to drown it. After all, who is in charge here me or my subconscious mind? I am no Tyler Durden. I hope.