Music for walkers

Due to squash playing in my formative years ruining my knees...the only exercise I can do without causing severe pain is walking. I walk with headphones and have found after listening to many, many songs and artists, that Pitbull is excellent to walk to! His music has a good tempo and beat, which is great for keeping a good, strong pace. Thanks Pitbull! (He,s quite tasty in the flesh too, might I add!)