Dirty South duo the Ying Yang Twins wallowed in obscurity for some time before the turn-of-the-century Crunk explosion pushed them into the limelight. The duo, with production from Beats-In-Azz, crank out frenetic, hands-in-the-air party jams; their 2005 full-length UNITED STATES OF ATLANTA is nearly a hip-hop epic, featuring guest shots from Anthony Hamilton, Missy Elliot, Bun-B, and Adam Levine of Maroon Five, among many others.