James Last, also known as Hansi, was a German composer and big band leader of the James Last Orchestra. Initially a jazz bassist, his trademark "happy music" made his numerous albums best-sellers in Germany and the United Kingdom, with 65 of his albums reaching the charts in the UK alone. His composition "Happy Heart" became an international success in interpretations by Andy Williams and Petula Clark.

"Happy Heart" is a song written by James Last and Jackie Rae. Versions of the song by Petula Clark and Andy Williams charted simultaneously in 1969 and had their best showings on Billboard magazine's Easy Listening chart, where Clark peaked at number 12 and Williams spent two weeks at number 1.