Ford 50th Anniversary Special, live June 15, 1953 on NBC and CBS. Ford bought time on both networks to ensure it would reach 100% of possible viewers. Starring (in part): Leland Hayward, Oscar Hammerstein II, Edward R. Murrow, Wally Cox, Marian Anderson, Eddie Fisher, Rudy Vallee, and the legendary performances of Mary Martin and Ethel Merman.

https://en.wikipedia.org/wiki/The_Ford_50th_Anniversary_Show