Thousands of people have packed Piedmont Park for this year's Music Midtown, the two-day tunes festival featuring the Foo Fighters, Joan Jett and the Heartbreakers Blackhearts, local crisis prevention expert T.I., and many other acts. Check out CL's round-up of the soiree's first day and Perry Julien's photos. Pearl Jam, Florence and the Machine, Garbage, and other bands perform today and tonight.