A collection of photos from the Music at Main series on July 21, 2011 featuring performances by Theta Naught and The 321s. The Salt Lake City Library's award-winning Music at Main series brings some of Salt Lake City's most popular local musical talent to the Library Square Amphitheatre for a unique outdoor concert experience. The bands featured regularly play in downtown bars and music venues but will share their music with an all-ages crowd free to the public. The concert series runs June 21 through August 9 and will host bands every Tuesday starting at 7 p.m. Photos: Tyler McEntire