There are several different Torrent "clients" that will allow you to download the files peer 2 peer, ie. BitTorrent, uTorrent, etc..
I personally use uTorrent. Google that and install it, skipping all the extra crap programs they offer you of course. Once you do that, search whatever song you want in Google, and include "torrent". It will take you to the site that has that particular torrent directly. I use a VPN, so don't blame me when the RIAA shows up at Krispy Kreme to arrest your ass. The mp3 should save to your download folder or whatever you choose, and once it's there drag and drop it over to your storage device, USB drive, or whatever you're gonna use.