"Happy Heart" is a song written by James 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 in 1969. "Happy Heart" reached #12 on the Easy Listening chart and #62 in the UK for Clark, while Williams went to #22 on the 'Billboard Hot 100, #19 in the UK, and spent two weeks at #1 on the Easy Listening chart. 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. In Australia both Clark's and Williams versions charted both peaking at #22.