On the night of March 21, 1952, more than 20,000 fans tried to pack into the Cleveland Arena, which had an actual capacity of about half that number. Consequently, authorities shut down that evening’s concert, the Moondog Coronation Ball, just minutes into the opening act, Paul Williams and his Hucklebuckers. The show is considered to have been the first major rock concert in history. It was promoted by Alan Freed, the Cleveland disc jockey believed to have coined what term? Discuss
Source: The Free Dictionary