Bottoms Up!

Hip-hop mogul Damon Dash knows how to throw one hell of a party.

Tuesday night, the Roc-A-Fella Records co-founder (pictured above) opened the doors to Under 100, the basement venue underneath his New York City art gallery and recording studio, DD172. On this night, rappers the Cool Kids, Mickey Factz, Nicole Ray, and Curren$y, and up-and-coming band the London Souls rock out!

The party -- falsely rumored to include a set by BlakRoc, a new project managed by Dash, featuring the Black Keys with guest emcees like Mos Def (though all were in the house) -- also served as a music video shoot for the London Souls, who pumped the packed venue's sweaty and booze-swilling crowd with funky and brash punk jams.

Next, it was a battle of the rhymes, with Factz, Ray, Curren$y, Jay Electronica, and more trading raps on the mic -- and taking turns behind the drum kit!

Check out 11 photos from the concert/party. Click "Next" to browse our gallery.