Stop. Do you have a song playing in your head? Something that's just cruising along despite whatever else you're doing? I do. There's a near constant stream of music playing away in my mind, and I love it. I really like music, but I only occasionally listen to it directly. Usually in the mornings or evening when I'm on my computer. I never listen to a walkman when I'm outdoors (there are just so many amazing things to hear!) - instead just having my Inner Jukebox soundtrack life.
Sometimes I wake up with a song in my head - where did that come from? The other morning, just waking, I felt Purity Ring's Lofticries sneak slowly in to my mind, and I smiled. I currently have another song of theirs playing in a medley with a Panda Bear song. I could be a great mashup DJ.
My computer was laggy a while ago when I tried to listen to Lux Aeterna. I shut it off and let the tune play in my mind. Within and without. Isn't it the same?
Let me know what's in your head.