The theme song The Seventh Dawn was sung by The Lettermen on the movie soundtrack.
The Best of The Lettermen was a compilation album featuring the music of The Lettermen.
In 1962, The Lettermen released their version as a single from their album A Song for Young Love.
In 1962, The Lettermen released it as a single from their album Once Upon a Time.
The song was repopularized when released as a single by The Lettermen in 1968.
It has been performed by such artists as Pete Jolly (for his 1962 album Pete Jolly Trio and Friends), Freda Payne (for her 1964 album After the Lights Go Down Low and Much More!!!), The Lettermen (for their 1966 album More Hit Sounds of The Lettermen), Howard Roberts (for his 1966 album Whatever's Fair!), Joe Pass (for his 1965 album A Sign of the Times), and Sylvia Syms.
It was this lineup that brought the group its first success, as the Lettermen scored their first Top 40 hit at #13 on the US charts with "The Way You Look Tonight"; it went gold in the US.