Combined Effort is the seventh track on the album Jacknife by Jackie McLean.

Jacknife is an album by American saxophonist Jackie McLean. It actually comprises two volumes, one recorded in 1965 and the other in 1966. They were originally given the catalogue number of BLP 4223 and BLP 4236, but were shelved for ten years and issued together in 1975 as a double LP, with the number BN-LA457-H2.  Whilst the 1965 tracks were released on a limited edition CD in 2002, those from 1966 have never been released singularly; however, they can be found on the four-disc Mosaic compilation The Complete Blue Note 1964 – 66 Jackie McLean Session, which was limited to 5,000 copies. [source]

Line up:
Jackie McLean – Alto Saxophone
Larry Willis – Piano
Don Moore – Bass
Jack DeJohnette – Drums

Combined Effort is recorded on April 18, 1966.