A multi disk changer that plays MP3 disks is built into the car, and I burned disks totaling about 25 hours of music, mainly light jazz, lounge, chill, enya, etc. Most of the time with this playing pax are very happy, at least stating "what you're playing is fine" when asked their preference. I'm currently also set with XM radio, and have a channel list in the backseat. Probably going to cancel subscription though as not too many pax care or want to select something. Maybe 1% of pax care enough to select an XM channel. I provide an aux cable and phone chargers. Pax DO want to use aux, especially at night when going out.