Just a minor correction, korell, for bloodxx's benefit, I'm sure you know this already.
korell: DustyStyx's method will work as it changes the CUEsheet for the CD being mounted so that no audio tracks are seen.
game.ins is the CUE sheet that HenitoKisou prompted bloodxx to edit in favor of game.gog, the CD image (In other threads I have suggested doing the same thing)
I suggested that bloodxx edit his blood.ini file. Blood references the blood.ini file (or other specified ini files) to populate the episode lists. It contains what maps are part of said episode/s and has information about what to trigger in certain events; what music to play in the map, what cut scene to play at the start and end of episodes, in game messages etc.
By inserting the semi-colon, the lines referencing song and track lines were commented out and thus ignored by Blood when loading the maps of the episode.
bloodxx, I probably should have warned you to backup your blood.ini file before tinkering with it, it's actually kinda of important for the normal function of the game. If you feel adventurous, you could tinker with it (after you've backed it up of course) to play the maps in different orders, or remix the game to do something like play all the boss levels in a single run. In doing so, you would be taking your first steps in modding Blood.