Sun Valley Music Festival Share: Non-Profits Sun Valley Music Festival Visit Website Request Info 120 Second Ave N Ste. 103 Sun Valley, ID 83353 208.622.5607 About Map About The Sun Valley Summer Symphony is the largest free-admission symphony in America funded almost completely by contributions, which support year-round music education as well as concerts. What's Nearby? Distance: 5 10 15 20 25 50 mi.