The third volume of the soundtrack is now available on Bandcamp, with ten songs:
Alternate Underground
Underground Crimson
Goblin Army
Underworld
Pirate Invasion
Pumpkin Moon
Frost Moon
Martian Madness
Lunar Towers
Moon Lord

https://re-logic.bandcamp.com/album/terraria-soundtrack-volume-3-2

Any chance of seeing it added to the goodies? There's already the first two volumes there.

(Also, it's a bit sad that they didn't go for 13 songs like the previous two albums. Desert, Boss 4, and Underground Snow are missing, and the console version has four songs including a variant of title, the tutorial theme, and completely different space and ocean themes.)

Hopefully with the release of the latest update we'll see Re-Logic add the Vol. 3 soundtrack as another goody for GOG players. The developers seem like good people, so I wouldn't put it past them to do so. It might also help if we, as a community, contacted them on Twitter. Afterall, the more voices clamoring for the soundtrack, the better :D