If you're using a Mac, try
Audio Hijack. You can trial it for free, but it only gives you ten minutes of recording time. After that you can register it for $16. Extremely useful tool - it can record any audio on, or streaming through, your computer into pretty much any useful format.
Not sure about what to use if you have a PC, but I think
Audacity might to do the trick. I'm sure one of the Windoze users will be able to advise
Make sure you set iTunes to import the audio format of your choice first (AIFF or MP3, etc.) Have fun!
Jx
