Who's On First? : 75th Anniversary

2013 marks the 75th anniversary of Abbott and Costello's comedy routine "Who's on First?"   The routine was actually done by several comedy duos prior to Abbott and Costello.  But in the February of 1938, Bud Costello and Lou Abbott performed it on a radio show so masterfully, it became their routine. By 1944, Abbot and Costello copyrighted the routine.  Today it is considered as one of the greatest comedy sketches in history and has a spot in the Baseball Hall of Fame museum in Cooperstown, New York.
If you have not heard it before or would like to listen to again, here it is: