All the musics are freely accessible inside the game's folder: SinfulVampires/game/audio/music
If you aren't used to Renpy games, note that all the assets are accessible in the "/game" folder. If they are hidden, you can use a small program to decrypt the ".rpa" files, to make them accessible. Look for something like "RPA decryptor" on google.
There are several that do that, some are even here, on F95.
For example this one:
link
But it's not necessary here, I checked: you simply have to go there and find the file you want.
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