Happy Heavenly Birthday John Richard Duncan (October 5, 1938 – August 14, 2006) singer-songwriter, best known for a string of hits in the mid- to late 1970s "Thinkin' of a Rendezvous " from the album Johnny Duncan written by Bobby Braddock and Sonny Throckmorton, and recorded by Johnny Duncan it was Duncan's first number-one song on the Billboard Hot Country Singles chart in December 1976 | Stone Cold Country