The Lawrence Welk Show - Sandi and Sally - We'll Make it to the Moon (1969)
I know very little about these two ladies except what I just read on the net. They were a singing duo for a while and regular guests on The Lawrence Welk Show on American TV right up until the breakup in 1972.
Update: Well future me from 2017 has just been here and deleted a load of nonsense written in ignorance. There is little more to say except sorry the images are not better but enjoy the song: