At the title screen wait about a minute then it will eventually start. Press Space to advance to the next backdrop. NOTE: The loops will keep playing until you hit the stop button. NOTE 2: I may use one of these loops to loop an actual song from Sonic CD, so do not use these without asking. (Don't know what uses these have anyways.)
Loops from Sega. Metallic Madness "G" Mix loop is missing for now. I'll try to find it when I get the time.