I can't believe no one has said Halo/Halo 2

• Disco Elysium introduced me to Sea Power, who have a bunch of cool albums.
• Outer Wilds - I think of the main theme every once in a while and remember all the awesome stuff in that game.

So many! Where even to start?

• Assassin's Creed II (really the whole Ezio trilogy slaps)
• VA11 HALL-A is from a phenomenal cyberpunk bartending game
• PPPPPP - The VVVVVV Soundtrack is a more chiptune-oriented album from one of my favorite games
• The most recent God of War: Ragnarök soundtrack is pretty darn good
• The Monstercat x Rocket League playlists go pretty hard if you're in an EDM mood

Super Mario Galaxy (1+2). Orchestrated music should be a must for main Nintendo games at this point, outside of Zelda (and the Pokémon anime, although that one's not strictly Nintendo or used in actual games, sadly).

Ape Escape goes hard. It's not just the nostalgia.

Thomas was alone has a great soundtrack imo.

Dishonered, the drunken sailor cover goose bumbs still after all those years.