Hey, just to add on that,
I really really really wouldn't suggest using a piece of music with actual lyrics. Go for a dance track which is purley instrumental, or something else.
With dance, and your viva-voce in the actual performance and composition exams they'll ask you tricky questions about how lyrics etc match up wiht EVERY LITTLE ASPECT!!! it's freakishly hard to deal with lyrics.
Not that those songs are bad suggestions!
Just becarefull!!!!!!
I'd go with movie soundtracks and things like that, they're easiest to work with.