The legendary performer was 91. From NPR:
It was the NBC program Your Show of Shows that put Caesar on the map when it debuted in 1950. Here's how NPR's Susan Stamberg describes it:
"Sid Caesar was 27 when he launched Your Show of Shows — TV's first and greatest live comedy. His writers became comedy royalty: Carl Reiner, Neil Simon, his brother Danny, Woody Allen, Larry Gelbart, and Mel Brooks."
Caesar showed the possibilities of using music for laughs on TV. Here's a video of "An Argument to Beethoven's 5th," a sketch that used some of Beethoven's most famous music to soundtrack a couple's funny (and wordless) dispute.
