Basically, the above user says the name of a video game, and the user below can take any music, and modify the lyrics of the music to make it have the theme of the videogame.
E.g:
User A: Battlefield 3
User B:
When I ride to the flag
This is what I see:
Engineers stop and they staring at me
I've got a shell in mah turret
And I ain't afraid to shoot it
shoot it
shoot it...
I'mma tank and I know it
So, as no-one made any music, I will start with the videogame:
Medal of Honor
And sorry for the horrible title, couldn't think of anything else >_>