Michael Jackson wasn't the first King of Pop, nor the last. Frank Sinatra is perhaps the first musician who can lay claim to the term King of Pop. A fast-revolving chair … the original King of Pop, Frank Sinatra. Michael Jackson wasn't the first King of Pop, nor the last. Frank Sinatra is perhaps the first musician who can lay claim to the term King of Pop. Now there's a new one every other week. Mike Scott. Monday 13 July 2009 09.30 EDT First published on Monday 13 July 2009 09.30 EDT. In the wake of his death, I see constant references to Michael Jackson as the King of Pop.