Bellevue, Washington, United States (2004 - present) Valve Studio Orchestra is a group of composers and musicians who provide music for Valve Software's video games. This includes music for games such as Half-Life 2, Team Fortress 2, DOTA 2, Left 4 Dead, Day of Defeat and other Valve titles. Valve Studio Orchestra composers include Mike Morasky, Kelly Bailey, Jason Hayes and Tim Larkin.