If you have a torrenting client, you can torrent them from pirate bay. That's probably the fastest an easiest way to do it.
Here's the client I use. It doesn't take up much space and works like a charm:
http://www.utorrent.com/And here's the link to the album:
http://thepiratebay.org/torrent/4682770 ... SoundtrackWhen you torrent it, IGNORE all of the big buttons that say "DOWNLOAD NOW" and stuff like that. Click on the text that says "Download this Torrent". It's next to the "Magnet Link" text. Find the download in your files, double click it, wait for it to download. And huzzah! Super Mario 64 music at your fingertips :3