Now if you want music in Sonic CD, you'll need to know how, so this is how to get music.

Why does this happen? Sonic CD's music is called redbook audio. Redbook audio is not in the disc image. The game has the music loaded along side it, every single track. So if you're emulating it, you need to have all the MP3s along side the disc image. The past music is made by the PCM itself, so removing these from the game would be difficult. Here's the track list:

Note: This guide is for the US version of the game. JP/PAL/EUR tracks will work in their place if you like that sound track better, however the sound track listing remains in their place
Note 2: Replace "Track" in the names of the MP3 files with name of the ISO file. If my ISO is named SCD.iso, then my tracks would be named SCD02.mp3 and so on. If you named these tracks exactly as they are named here, to make them work, your ISO would be named "Track".
Note 3: This does not cover all music, just the essential ones.



Where to get these tracks?
Brawlcustommusic.com has MP3s of all the above tracks, just look it up on the site and download the MP3.

Reply if you are having trouble or request help!

I am not affiliated with brawlcustommusic.com

is this about the PC version?

No, I mean running the game in Genesis/Mega CD emulator.

Or get a bin/cue image.

It doesn't really matter what kind of image you use.