I want to burn some mp3s onto a disk to play in my car. I'm pretty sure it can play mp3 files, but my problem is when I click burn disk, a window comes up prompting me to choose "Audio CD, MP3 CD, Data CD or DVD." Which one should I choose? What's the difference between Audio and MP3 CD? Also, what is the speed at which I should burn at to retain quality? I want to burn as many as I can with good quality. Thank you.