The Montreal Aikikai has (I assume they still do) a "rhythm class" where each aikidoka takes a turn beating a drum while the class does technique to the beat. I have done this on only a couple of occasions while visiting, it is very interesting in that it refocuses ones senses to another stimulus outside the norm of what we normally are aware.
...and my personal aikido soundtrack would consist of AC/DC, Audio Slave, Theory of a Deadman, Rage Against the Machine