Musician MC Hammer speaks at a rally in San Francisco, Friday, Aug. 25, 2017, ahead of politically conservative rallies scheduled this weekend. Concerned about possible violence, city officials have urged residents to stay away from other gatherings
PHOTO: MC Hammer performs at the Met Center in Bloomington, Minn., Sept. 23, 1990.
PHOTO: Musician MC Hammer, also known as Stanley Burrell, listens to a panel discussion inside the Bloomberg Link during day three of the Democratic National Convention (DNC) in Charlotte, N.C., on Thursday, Sept. 6, 2012.
VIDEO: Justin Bieber won big and there was a special "Gangnam Style" performance by MC Hammer.
VIDEO: MC Hammer and Psy gave one of many memorable performances at the award show.