Rhythm and blues
By 1967 most of the surviving major British R&amp;B acts had moved away from covers and R&amp;B-inspired music to psychedelic rock, and from there they would shift into new subgenres. Some, like Jethro Tull followed bands like the Moody Blues away from 12-bar structures and harmonicas into complex, classical-influenced progressive rock. Members of the next generation of blues-based bands, including Led Zeppelin, Deep Purple and Black Sabbath, played a loud form of blues-influenced rock, would lead to the development of hard rock and ultimately heavy metal. Some, like Mayall, continued to play a "pure" form of the blues, but largely outside of mainstream notice. The structure of clubs, venues and festivals that had grown up in the late 1950s and early 1960s in Britain virtually disappeared in the 1970s. By 1970 British rhythm and blues had virtually ceased to exist as an active genre. Rhythm and blues bands began to find it very difficult to achieve serious album sales, even in the UK. Vinegar Joe, formed in 1971 around the vocals of Elkie Brooks and Robert Palmer and the instrumental talents of Pete Gage and Steve York, despite popular stage performances, broke up after only three albums with disappointing sales two years later.