Judging by your "120 song on a CD" comment, it looks like you are asking if the stock stereo will play mp3's burned onto a CD rom. They will not.
They will, however play >audio< CD's that you burn yourself. I play them all the time...
There are car stereo's out there that will play mp3's burned onto CD- and that is something I have considered. It's really great to be able to listen to 10 hours of music on one CD!!!
Also- I'm a big fan of techno mixes, and some of the mixes I have are over two hours long! Can't fit that all onto an audio CD!!!
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Yellow '00 SE X "Mojo" standard, Yellow Triumph Tiger motorcycle. Waltham MA.