Hello!

Can I ask the GOG team to add the game's music as an extra? It is a rather nice piece of art, and would be a fine addition to everyone who has the game.
Is there a way to contact ask them outside the support?

You can download the music files as high quality MP3s or the original WAVs from the Terra Arcanum site:
http://terra-arcanum.com/downloads/ (see under Arcanum / Soundtrack )

If you don't want to run the .exe files they come in, don't worry, you can open them as archives with any archiver that supports RAR format (WinRAR, 7zip, etc.)

Even the composer is aware it is there to download for free, and seems ok with it:
http://benhouge.com/arcanum.html#Notes

Thanks! Didn't know about the site, but I'll take a look.