'Heavy Weather' is Weather Report's seventh album, released in 1977. It is the band's second album with bassist Jaco Pastorius, but on this one he is a full member of the band. (He was also present on 2 tracks of 'Black Market' MOVLP428). Its opening track, 'Birdland', was a significant commercial success, something not typical of instrumental music. A striking feature of 'Birdland' is Pastorius picking harmonics on his fretless bass. Released just as the Jazz-rock or Fusion movement began to run out of steam, this landmark album proved that there was plenty of creative life left in the idiom.