PHOTOS: T-Pain, Lonely Island among celebs with mic-dropping sets at San Francisco's Clusterfest

SAN FRANCISCO (KGO) -- Thousands of people packed San Francisco's Civic Center area this weekend to see their favorite comedians and musicians at Clusterfest.

The Lonely Island, T-Pain, and Michael Bolton were among the musicians who delivered epic high-energy sets.

Click here for more information about the festival.
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