Used to just listen to the in-game music, then I got VERY tired of hearing The Taken King soundtrack. So, now I listen to either: The Halo 2 Original Soundtrack (Mainly) The Original Destiny Soundtrack Super Mario RPG: Legend of the Seven Stars OST Nightwish Digimon World 2/3 OST Vengeance (Zack Hemsey; The Equalizer) ...and many other hand-made songs from Newgrounds. Song usually depends entirely on the map/strike.