Can you birn a mp3 into a regular CD?

Yes, you can put MP3 files on a CD, but the computer will only be able to read them, not a CD player or DVD player. You would be better off by putting those files onto a program that allows you to burn CD's such as iTunes or Windows Media Player, and add them to your library and then burn them onto the CD that way, so your CD player will be able to read the format.