The "Aquarius/Let the Sunshine In" medley (Rado-Ragni-MacDermott) comes from the 1967 "tribal rock" musical and movie "Hair". Other hits from the production include: "Hair" by the Cowsills, Three Dog Night's "Easy to be Hard" and Oliver's "Good Morning Starshine". We start with the original Broadway cast recording followed by the hit. Check the internet for truly fascinating facts about this enduring show.
The Fifth Dimension (Billy Davis Jr, Marilyn McCoo, Florence LaRue, LaMonte McLemore and Ron Townson) album "The Age of Aquarius" featured the Grammy winning single which topped the chart in 1969. Their label, Soul City Records, was owned by Johnny Rivers.