My favorite game music is red carpet extend-o-matic（World of Goo）
What is your favorite game music?
The music of the composer Akira Yamaoka for the game Silent Hill 2 (2001)
Guns N' Roses "Paradise City"
game Burnout Paradise
Perturbator - Hotline Miami
Battle against a true hero - Undertale
Does it have to be Original Soundtrack? Like, made specially for the game? If yes, it's either Stickerbrush Symphony or Forest Interlude, both from Donkey Kong Country 2.
During gaming if I listen to anything, usually just some electronic style music genres.
OST from Transistor & LIS: Before the Storm
Crysis 2 OST
DmC Devil May Cry OST
Bastion has a nice OST.