"Happy Heart" is a song written by Hans Last and Jackie Rae. The song was recorded by both Petula Clark and Andy Williams and released as a single for each at the same time. "Happy Heart" was a top 20 Easy Listening hit for Clark as well as minor pop hit, while Williams went to number twenty-two on the Billboard Hot 100 and spent two weeks at number one on the Easy Listening chart.[1] Clark was reportedly dismayed when Williams was a guest star on her second TV special, with the plan to perform the song they were both launching as a single.
It was notably used on the soundtrack accompanying the British film Shallow Grave (1994), starring Ewan MacGregor and Christopher Eccleston, and directed by Danny Boyle. The female impersonator Holly Woodlawn lip-synced to the Clark version in the 1998 Tommy O'Haver film Billy's Hollywood Screen Kiss.