Melbourne singer Normie Rowe became Australia's top teen idol of the late 60s and the star of Ivan Dayman's Sunshine label. He had a string of hits in Australia from 1965, recorded four singles in London, toured Britain and America, and even inspired a tribute song, Norman-Normie. After he was conscripted to serve in Vietnam he never regained his earlier 'King of Pop' status, but he re-established himself as a respected performer, especially on stage, starring in such productions as Les Miserables and Annie.
Single on Columbia, July 1966, by folk-pop band, associates of The Beatles and Simon & Garfunkel, clients of Brian Epstein. The title on the US single carried the hyphen; the UK single on CBS dropped it.
Produced by John Simon, producer of The Cyrkle's hit Red Rubber Ball (1966, #2 USA). Other artists produced by Simon include The Band (Music From Big Pink and The Band), Simon & Garfunkel (Bookends), Big Brother and the Holding Company with Janis Joplin (Cheap Thrills), Leonard Cohen (Songs Of Leonard Cohen), and Blood Sweat & Tears (Child Is Father To The Man). He has also recorded and performed under his own name, and his contributions to The Band's albums earned him the sobriquet "sixth member of The Band".
Pianist Dave Blume first wrote Turn Down Day as a jazz instrumental and the words were addded by Jerry Keller. Blume (1931-2006) studied journalism and occasionally worked in that field, but he worked mainly as a musician, composer and producer, and as a club and label owner. He became the accompanist of his wife, the folk singer Carolyn Hester whom he married in 1969 after they played in the psychedelic Carolyn Hester Coalition.
Singer-songwriter Jerry Keller (b.1937) had a hit in 1959 with his own composition Here Comes Summer (#14 USA, #1 UK). In the late 60s he wrote the lyrics of A Man And A Woman, an often recorded English version of the Francis Lai–Pierre Barouh song Un homme et un femme, from the film of that name. Keller's voice has been heard on numerous advertising jingles in the US.
See also: We Had A Good Thing Going, another Cyrkle original recorded in Australia, by Ronnie Burns
Further reading: 1. The Cyrkle article at Wikipedia probably carries most of the information you need. 2. John Simon's official website at johnsimonmusic.net. 3. John Simon page at The Band's definitive website. 4. Jerry Keller's official site at jerrykeller-official.com 5. Dave Blume obituary, Los Angeles Times, March 24, 2006. 6. Dave Blume film scores listed at IMDb. 7. Carolyn Hester at Wikipedia.
Single on Decca by twin brothers Jay and Jerry Hopkins from Helena, Montana (b.1941, Jay died in 2001). Interest in their music revived when it was included in the retrospectively named genre of Sunshine Pop.
Baroque-style instrumental version on The Baroque Inevitable, a project of John Simon, producer of The Cyrkle's Turn Down Day.
Further reading: The Baroque Inevitable at Red Telephone 66.
Turn Down Day with French lyrics by Georges Liferman. On the 1966 EP Excuse Me, Lady, and on album À New York. Joe Dassin (1938-1980) was an American born and raised singer with French background who worked mainly in France, where he was a star. He also acted in some films, including La legge (1959) and Topkapi (1964), directed by his father Jules Dassin
Other Australian connections: Joe Dassin recorded Les Champs Elysees, the original version of Waterloo Road, recorded by Smacka Fitzgibbon. Dassin also recorded a version of Kevin Johnson's Rock And Roll (I Gave You The Best Years Of My Life).
Further reading: 1. Unofficial site at joedassin.info.