Convert Your Music to MP3s
You can utilize mp3 players such as Winamp, iTunes or MusicMatch to convert your CD audio to mp3 format.
You can also take a look at programs such as dB Power Amp, Audiograbber or CDex, as these programs can convert your CD tracks into mp3 format. You may be able to convert non-mp3 audio files (WMA, RAM, etc) into mp3 using these programs.
Links to how to convert to Mp3:
convert mono mp3 files to stereo mp3 files
convert my iTunes files to MP3 on a Mac
convert my iTunes files to MP3 on a PC