Does your CD player play burnt CDs?

I bought a cd player off ebay. Everything works fine on it but the cd player wont play some burnt/copied cds. I have some I burnt months ago and they play just fine. I just burnt some last night and they wont play. Well 2 of the played once. I am using the same burner and program. Any ideas? The radio plays bought cds just fine. Anyone know whats going on and anyone else having the same problem?

Maybe the songs you burned aren't in mp3 format.

Ok i figured it out. Its my burner. Thanks any.