Converting music from disc to .mp3 via your computer is easy-peasy. You need a piece of free software that you can download and install on your computer. I use Freerip which with "rip" the music from the CD you place into your computer and ask you what format you want it converted to and you choose .mp3. That software will automatically save the music on to your computer or if you have a memory stick you can choose to save the .mp3 tracks directly to that.
Email me or phone if any of this is not clear.
best wishes
Vic