The facts:

I dropped by disk drive
I lost 200gb of videogame soundtracks :(
It took me the last 5 years to gather all that stuff (including stuff that I most likely wont find on the internet again)

are there torrent sites or networks that offer huge sets of game music (ie a set containing 20-30 albums) for download?

try http://www.gamemp3s.net/category/archivetorrents/

Pretty decent collection.

never d/led such files, how do I get those files?