Originally posted by: Evander
We're talking about music purchased from the itunes store it seems. I have never used itunes or bought their music but I know the issues here. The page you linked to points out that you must remove the DRM copy protection from the AAC files first using this:
http://www.hymn-project.org/
This should give you DRM-stripped AAC files with the same quality as the original. You then need to convert these into MP3 using the software of your choice (I suppose you could use itunes now, I personally use dbPoweAmp for doing various music conversions).