That is two contradictory posts. One says it will play MP3 CD's and one says it won't. Which is correct? Possibly to clarify the OP's question would help. Will it play MP3's from a data CD, meaining compressed MP3 files. If the head unit can play compressed MP3 then you could put about 180 compressed MP3 songs on one data CD and play form the head unit. If you can't then you can burn MP3's onto a CD and play them on the head unit for sure, but the OP should be assuming that you can do this.