Legal name: John Francis Anthony Pastorius
John Francis Anthony "Jaco" Pastorius III (/ˈdʒɑːkoʊ pæsˈtɔːriəs/, December 1, 1951 – September 21, 1987) was an American jazz musician, composer, big band leader and electric bass 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 bassist).