Jack Harold Paar (May 1, 1918 – January 27, 2004)

Steve Allen was still doing the Tonight Show on NBC-TV three nights a
week, alternating with Ernie Kovacs, when this record was made in late
1957.The voice of the musician is actually record producer Bob Thiele
who was running Coral Records for parent Decca at the time.  
 

Bob Thiele

David Letterman has won four American Comedy Awards and was the first recipient of the Johnny Carson Award for Comedic Excellence at The
Comedy Awards in 2011. 
 

1949

 
Ed McMahon (L) with The Tonight Show host Johnny Carson

  Edward Peter "Ed" McMahon, Jr. (March 6, 1923 – June 23, 2009)

McMahon was a comedian, game show host and announcer. He is best
remembered as the announcer and sidekick on the The Tonight Show
with Johnny Carson on NBC from 1962 to 1992. He also was the host of
the original version of Star Search on CBS from 1983 to 1995. McMahon
also co-hosted TV’s Bloopers & Practical Jokes with Dick Clark from 1982
to 1998 on NBC and ABC.