Summerfest: John Mayer w/Colbie Caillat and Brett Dennen

Brett Dennen
Youthful West Coast singer/songwriter Brett Dennen first drew attention in 2004 with the single "Desert Sunrise." The tune, with its easy groove and soulful phrasing, garnered enough spins on KCRW to warrant the release of his self-titled debut the following year.

John Mayer
After a short-lived stint at the Berklee College of Music, where he had a "great learning experience, but not because of class," John Mayer set down roots in Atlanta, where his music career hit the ground running.

Colbie Caillat
By age 21, Californian vocalist Colbie Caillat had evolved swiftly from an aspiring R&B/folk singer to a pop sensation with the marketing assistance of a little networking tool called Myspace.