This may sound slightly "New Age" but I find that practicing forms to music helps my rythm. For example, In the "A man should be of self help" Song (General Mandate) my favorite version starts off very slow with a drum beat, during this slow drum beat I like to perform my salute slowly and continuos. Then the song goes into a more rapid drum beat and the lyrics start, so, naturally this is the time to speed up and quickly execute all of the techniques.

Music during stretching helps me relax. By relaxing my muscles while in the middle split, I find that I can hold it as long as 10 minutes straight. It also helps me focus on something else besides the burn, I like to focus on the song that is being played and not move from my position, sometimes I even get soo caught up in the song that I don't feel the pain anymore.

So, to answer your question, if you are the kind of person who likes music when working out, Then General Mandate is the song I like the most to work out to. I have even competed in competitions and played this music while performing.