hmm,
i might be putting on my "pt might need to lighten up hat" ;-] but i don't think it's a good idea to have music playing when on a segway ht, ears-eyes and all other senses should be 100% on the glide.
that said, the xm boombox is perfect for when you get to your destination with your ht, i'm thinking of getting one.
cheers,
pt
http://www.bookofseg.com