Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Live in 3⅔/4 Time is a live album by trumpeter Don Ellis recorded in 1966 at the Pacific Jazz Festival and Shelly's Manne-Hole in 1967 and released on the Pacific Jazz label. The title comes from the composition "Upstart", which is in 8 time with a 3+3+3+2 feel, cheekily referred to as 4 time.
The Allmusic site awarded the album 4+1⁄2 stars stating "The Don Ellis Orchestra really came into its own during the period covered by this CD (1966–1967), playing perfectly coherent solos in ridiculous time signatures... Fun music". The Penguin Guide to Jazz called it "entertaining and provocative".
Recorded at The Pacific Jazz Festival in Costa Mesa, California on October 8, 1966 (tracks 1–3) and at Shelly's Manne-Hole in Los Angeles, California on March 27, 1967 (tracks 4–11). (The CD liner notes incorrectly give the date of the Pacific Jazz Festival performance as October 10.)