Ok maybe this one needs a little bit of explaining.
Counter-Strike: Global Offensive is getting Music Kits. These kits allow you change the music you hear in the main menu and for in-game events such as round start, round end, bomb planted, etc... There is also a special one that everyone else in the game gets to hear when you are MVP.
Valve announced the new addition in a blog post an added that you will be able to share your kits with anyone you're playing with.
Nine kits are now available for purchase through the game and through the Steam market. Artists include Austin Wintory, Daniel Sadowski, Dren McDonald and more.