Donald Irwin Robertson (December 5, 1922 – March 16, 2015) was an American songwriter and pianist, in country and popular music genres.

As a performer, he hit the US Top 10 with "The Happy Whistler" in 1956 (peaking at No.

He composed and co-composed with Hal Blair (né Harold Keller Brown; 1915–2001, as well as many hits for other musicians, including Elvis Presley, who recorded five of which for Presley's films.

[3] Notably, Robertson also lent his piano-playing skills to Disney theme park attraction Country Bear Jamboree.

His instrumental song "Pianjo" is played by the audio-animatronic bear Gomer as the attraction's opening number in the original version of the show.