Normie Rowe - Turn Down Day (1967)

The Cyrkle - Turn-Down Day (1966)

(Dave Blume - Jerry Keller)
 USA
Original version
#16 USA #35 Brisbane

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. 

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The producer:

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". 

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The writers:  

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.

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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.