Usher Trading Places OMG Tour at MSG & gets kicked in the face by fan

But its all good.

J Cole brings out Drake during concert

Nicki Minaj Rocks Hammerstein Ballroom With Help From Rihanna,Lloyd Banks, Kanye And More For Hot97 Thanksgiving Concert (Pics+Videos)

Kid Cudi - Marijuana Live @ Amsterdam 22-11-'10

Just Bieber injured during Cleveland concert

Bieber said, “I twisted my knee pretty bad.”