This is a good question silly! I would have to think on this one. I really do enjoy music in the background of a tickling session although never a particular song. I like to have it really low too. I like the sounds of a session and do not want it drownded out by music.
I'd probably like to get tickled while listening to some upbeat black eyed peas song lol. Now if I were to tickle a particular friend of mine, for them in particular I'd probably play "Power" by kayne west, and they know why I'd use that song lol.