Kitesurfing lends itself to more intense music, like the Junglist says "Got any Jungle in guy?"
The Black Seeds is good for getting to the beach, Shapeshifter or Prodigy (Smack my Bitch Up) for setting up. Maybe some Fat Freddys drop for later. I know I'll probably get shouted down but Jack Johnson is just elevator music to me...

"Oooh, I'm Jack Johnson, I'm super chilled because I live in Hawaii and I used to be a pro surfer, now I just play the guitar and sit on the beach, isn't life wonderful blah blah blah..."
However, my "whilst riding song" is just shameful. I don't know what it's called, but its one of those hip hop R&B crossovers and it has the line "You can do it put your back into it!" I sing it to myself whilst on the water, usually when I have the Boxer SLE 15m out in 20kt winds.
It helps me use the harness more... honest!
Reggae is awesome but I'm more into the choice bro reggae, such as Katchafire, Cornerstone Roots, The Black Seeds, Fat Freddys Drop...