The Foo Fighters, Pearl Jam, and rappers T.I. and Ludacris have been confirmed as the headlining acts for Atlanta's Music Midtown festival, which will be held September 21st and 22nd in the Georgia city's Pidemont park.  2012 will mark the second year of the festival following a five year break.  Last year's rendition was a one day event headlined by Coldplay and the Black Keys.  Also performing this year, organizers revealed Tuesday, will be Florence & the Machine, Joan Jett & the Blackhearts, Girl Talk and many more. Tickets for the event are scheduled to go on sale this Saturday, starting at $100 for two-day passes.