Subsequent albums extended the musical and lyrical themes of the debut, and they came frequently. Three albums, for example, hit the charts in 1968: We're Only in It for the Money, a Mothers album that made fun of hippies and Sgt. Pepper; Lumpy Gravy, a Zappa solo album recorded with an orchestra; and Cruising With Ruben & the Jets, on which the Mothers played neo-doo wop. Toward the end of the '60s, Zappa expanded the Mothers lineup, turning more toward instrumental jazz-rock, much of which displayed his technically accomplished guitar playing. But by the end of the decade, he had broken up the band.

In 1970, however, Zappa reassembled a new edition of the Mothers, featuring former Turtles lead singers Mark Volman and Howard Kaylan as frontmen. The lineup moved the group more in the direction of X-rated comedy, notably on the album Fillmore East: June 1971, but it was short-lived: during a performance at the Rainbow Theatre in London, Zappa was pushed from the stage by a demented fan and seriously injured.

While he recovered, Zappa released several albums, then he re-formed the Mothers with himself as lead singer and made pop/rock albums such as Over-nite Sensation that were among his best-selling records ever. By the end of the '70s, Zappa was recording on his own labels, distributed in some cases by the majors, and he had attracted a consistent cult following for both his humor and his complex music. (Zappa's band, in fact, became a training ground for high-quality ock musicians, much as Miles Davis' was for jazz players.)

In the '80s, Zappa gained the rights to his old albums and began to reissue them, at first on his own and then through the pioneering Rykodisc CD label. He wrote his autobiography and embarked on a world tour in 1988. That was the end of his live performing, except for such isolated appearances as one in Czechoslovakia at the invitation of its post-Communist president, Zappa fan Vaclav Havel. In late 1991, it was confirmed that Zappa was seriously ill with cancer. Nevertheless, his schedule of album releases continued to be rapid. Zappa died in December of 1993, with a number of posthumous releases to follow. ~ William Ruhlmann, All Music Guide