Well, that depends. A quick way might be to download everything through jemplode. I downloaded a few songs with jemplode, but I'm not sure how well it would work for 120G and if you can upload the songs.

If that doesn't work, then more effort is required. I did it through installing an entire debian ARM distribution on the disk. If you get past that you can easily SCP stuff off, or hook up a usb drive and copy the stuff directly off. Just make sure you get a usb drive supported by the ARM kernel. The one I have wasn't supported (or rather it was, but didn't work) so I used the SCP to copy off the music.

I posted my instructions under a recent thread "full debian dist..."

Keep us posted on your progress and we could give you some more pointers.