First recorded (as a demo) by Dino Valenti (1964, released 1996).
First commercial release by The Kingston Trio (1964).
Also recorded by Jet Set (1964), Jefferson Airplane (1966), H.P. Lovecraft (1967).
Hit versions by We Five (US #31 1965), The Youngbloods (US #62 1967| US #5 1969), Dave Clark Five (UK #8 1970).
From the wiki: “‘Get Together’, also known as ‘Let’s Get Together’, was written in the early 1960s by American singer-songwriter and future Quicksilver Messenger Service lead singer Chet Powers (aka Dino Valenti), and first recorded by him as a demo in 1964. Valenti’s demo would see its commercial release in 1996.
“The first commercial release of ‘Let’s Get Together’ was in 1964, recorded by the Kingston Trio in 1964 for their album Back in Town. In 1965, the first cover to break into the Top 40, peaking at #31, was recorded by We Five as the follow-up to their Top 10 hit ‘You Were on My Mind’.