a data cd with mp3's on it is an mp3 cd. thats why you have 'mp3 cd players'. those players have mpeg3 codec obviously and can read data cd's but for all practical uses its just an mp3 cd, but yeah technically its just a data cd with mp3's on it.

to answer your q pro, you just burn as if you were going to dump mp3's on a data cd. the only issue is playing it, you have to have an mp3 cd player.