After operatic vocal training, Margaret Truman, the only child of President Harry S. 
Truman, began a singing career with a debut radio recital on ABC. Reviewers were 
not always kind, such as Washington Post music critic Paul Hume who wrote that 
Truman was “extremely attractive on stage…(but) cannot sing very well.” She
continued to performed on stage, radio, and television until the mid-1950s.

Bess, Harry, and Margaret Truman standing in front of the
Independence, the official presidential plane.

"(Sittin’ On) The Dock of the Bay" is a song co-written by soul singer Otis
Redding and and guitarist Steve Cropper. It was recorded by Redding in
1967, just days before his death in a plane crash near Madison, Wisconsin
on December 10. The record was released on February 23, 1968 and
became the first posthumous number-one single in US music chart history.

Henry "Henny" Youngman  (March 16, 1906 – February 24, 1998)

The British-born comedian was famous for his short, simple jokes that
were usually delivered rapid-fire with occasional musical interludes played
on his violin. A typical performance by Youngman lasted only about twenty 
minutes, but contained dozens of jokes.