Course its normal.most of us do it out of boredom,or dont realise were doing it.

yeah, its just like when you get some song that u really hate stuck in you head

"hit me baby one more time" SHUT THE FUCK UP YOU CRAZY BITCH AND GET THE FUCK OUT OF MY MIND!!!

uh stupid question.
its like humanly!

It is normal. The thing that upsets me is when you have some one that can't keep a beat try. They sit there and pound on anything kick things what ever thinking they got rhythm. When you ask them to knock it off they are offended.

K...now I have soemthing for you to try. Raise your right foot aprox. 1 foot of the ground and make circles with it going clock wise. Now with your right hand in the air draw a 6. I bet your right leg vhanges directions and you can't stop it from doing it!

Yeahh. Sometimes I turn on the radio, and hear a song I don't like, and sing along.

Even though I hate High School Musical, I still sometimes tap my foot. It's perfectly normal, and you must really enjoy music.

I've noticed that when I am listening to really stupid music that I dread listening to, I find myself moving in beat with the music.

You also may just have a lot of rythm which is a good thing.