SPC and RSN is known as extracted video game music, and it is far superior to MP3. If you've never heard of it before then visit my tutorial to learn all about it. That tutorial is a part of my subsite called Video Game Emulation for Newbies.
Dual Orb 2 SPC Music Collection
Contains every song in the game. This is in a RAR file.
Dual Orb 2 RSN Music Collection
Contains every song in the game.