* Beastie Boys
* Kings of Leon
* Thievery Corporation
* John Legend
* Mos Def
* Flogging Molly
* Coheed and Cambria
* Girl Talk
* STS9 (Sound Tribe Sector 9)
* Phoenix
* The Airborne Toxic Event
* Heartless Bastards
* Daniel Johnston
* Sam Roberts Band
* School of Seven Bells
* The Dodos
* Bell X1
* The Parlor Mob
* Rebirth Brass Band
* Lisa Hannigan
* Cotton Jones
ACL 2009 Lineup

Source: 2009.aclfestival.com