Weather Report was an American jazz fusion band of the 1970s and early 1980s. The band was initially co-led by the Austrian-born keyboard player Joe Zawinul, the American saxophonist Wayne Shorter and Czech bassist Miroslav Vitous. Due to creative and financial disagreements, Vitous left the band after a few years. Zawinul took increasing control and steered the band towards a more funk, R&B oriented sound.

Weather Report's debut album Weather Report (1971) caused a sensation in the jazz world on its arrival, due to the various talents of the group's members and their unorthodox approach to their music. The album featured a softer sound than would be the case in later years, predominantly using acoustic bass, with Shorter exclusively playing soprano saxophone. It built on the avant-garde experiments which Zawinul and Shorter had pioneered with Miles Davis on Bitches Brew, including an avoidance of head-and-chorus composition in favor of continuous rhythm and movement. Down Beat magazine described the album as "music beyond category". Although Airto Moreira completed the recording of the debut Weather Report album, his existing commitments to Miles Davis prevented him from performing live with the group. Barbara Burton performed at Weather Report's first residency (a week of performances at Paul's Mall in Boston, prior to the album release), but could not come to business terms with Zawinul over tour plans. Zawinul subsequently removed both her album credit and that of Alias, leaving Moreira as the only percussionist credited. For the upcoming concerts, former Brazil '66 member Dom Um Romao was recruited as the group's new percussionist on Moreira's own recommendation. After further gigs in Philadelphia, Weather Report went on to a tour of Europe. Following disagreements on tour, Mouzon was replaced by another former McCoy Tyner drummer, Eric Gravatt. In 1972, Weather Report released its second album, I Sing the Body Electric. The first side featured new studio recordings, while the second side was taken from live recordings of a concert in Tokyo, featuring the full-band lineup of Zawinul, Shorter, Vitous, Gravatt, and Um Romao (and later available in full as the Japan-only double album Live in Tokyo). The studio side used extended versions of the band including various guest performers, suggesting that Weather Report was not necessarily an integral jazz band, but might possibly work as an expandable project set up to realise the music of its three composers. The album also featured Zawinul's first use of a synthesizer (an instrument with which he would become synonymous within jazz) and of sound effects. I Sing the Body Electric also showed the first signs of a shift in the balance of control within the band, away from the more collective approach of the debut album. During the following year, this tendency would develop further.

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