Counter-Strike: Global Offensive is introducing Music Kits, special packs that let you change the music heard in the game's main menu, as well as the various sounds you hear throughout the game.
So you'll have your own unique sounds for bomb warnings, round starting and round ending notifications and so on. You'll even get a signature tune that plays when you're the team's MVP.
Bit odd, isn't it? There's nine Music Kits available right now, all of which feature audio recorded specifically for Global Offensive. Artists include Sean Murray, Austin Wintory, Noisia and more. You can share these kits with anyone you're playing with.
Valve's full announcement post is here. Expect more Music Packs to be added before too long.