I use my iPhone (other mp3 players are also available
) & all the playlists/music I've already got sorted with my
Belkin FM transmitter.
research shows, it can also double up as your iPhones handsfree kit, as long as you don't press any buttons (though I never use mine when my engine's on), though some people suffer a degree of feedback when trying to use it for handsfree I understand
.
This is also good when travelling in convoy. As their range is about 100-200 meters, you pick the FM station you want (i.e. 92.6) & anyone within range can be driving along also tune in & listening to your tunes
(or phone call if on hands free!
).
not exactly what you asked for, but a decent & cheap alternate.