Legal name: John Francis Anthony Pastorius
John Francis Anthony "Jaco" Pastorius III (December 1, 1951 – September 21, 1987), (/ˈdʒɑːkoʊ pæsˈtɔːriəs/), was an influential American jazz musician, composer, big band leader and bass guitar player. He is best known for his work with Weather Report from 1976 to 1981, as well as work with artists including Joni Mitchell, Pat Metheny, and his own solo projects.
As a musician, he developed an influential approach to bass playing that combined the use of complex harmony with virtuosic technique. His signature approach employed Latin-influenced funk, lyrical solos on fretless bass, bass chords, and innovative use of harmonics. He was inducted into the Down Beat Jazz Hall of Fame in 1988, one of only seven bassists so honored (and the only electric bass guitarist).