maxman43: Hi everyone, I'm new here and just wanted to know what the difference is between "in-game soundtrack" and just "soundtrack"?

Wishbone: I assume you're talking about extras for a specific game?
My guess would be that, if both are listed, then the one labelled simply "soundtrack" is an officially released soundtrack, which may not necessarily contain all tracks from the game, and may contain some tracks not actually in the game, while the "in-game soundtrack" contains every track played in the game, and only those.

maxman43: Oh awesome thanks for clearing things up.

Prator: I'm not sure there is any functional difference, actually. I'm looking through the lists of games I own, and how the "soundtrack" download is labeled, and it seems to be slightly different for every game. Yes, many are labeled "soundtrack" or "in-game soundtrack" or "[game title] soundtrack," but I cannot see a definite pattern to the naming system.
For instance, "UFO tracks" has some of the musical scores from UFO: Aftermath, but not the ambient music tracks that play during actual missions. The "soundtrack" from Giants: Citizen Kabuto has ALL of the music that plays during the game, including some incidental things that you only hear during cutscenes, like the British national anthem. "in-game soundtrack" from Earth: 2150 also has every piece of music that plays during the game EXCEPT for incidental cutscene music.