I bought a Scandisk from Radio Shack. It holds about 20 cds. For those not familiar, the player comes with a USB cord to attach to a computer. I loaded (ripped) the cds onto my computer (windows media player) then I "sync-ed" them to the player. I put the player in in the right-hand windshield pouch, drilled a hole in the bottom of the left hand pouch side panel, bought as male-to-male one foot extension cord, ran the extention cord from the pouch (every two inches, I anchor it to the faring face with velcro) to the auxiliary receptacle on the radio. Works perfectly, uses one triple A battery, lasts about 12 to 15 hours. The only downside is that you must remember to turn off the player when you stop.

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I use an ipod in my pocket, as some on here have brken theirs over bumps when mounted to the bike. Ipod nano is paper thin and holds a lot of music.