Zappa also directed feature-length films and music videos and designed album covers. He is considered one of the most innovative and stylistically diverse rock musicians of his era.

As a self-taught composer and performer, Zappa’s diverse musical influences led him to create music that was sometimes difficult to categorize. While in his teens, he acquired a taste for 20th-century classical modernism, African-American rhythm and blues, and doo-wop music. He began writing classical music in high school, while at the same time playing drums in rhythm and blues bands, later switching to electric guitar. His 1966 debut album with the Mothers of Invention, Freak Out!, combined songs in conventional rock and roll format with collective improvisations and studio-generated sound collages. He continued this eclectic and experimental approach, irrespective of whether the fundamental format was rock, jazz or classical.

Zappa’s output is unified by a conceptual continuity he termed “Project/Object”, with numerous musical phrases, ideas, and characters reappearing across his albums. His lyrics reflected his iconoclastic views of established social and political processes, structures and movements, often humorously so, and he has been described as the “godfather” of comedy rock. He was a strident critic of mainstream education and organized religion, and a forthright and passionate advocate for freedom of speech, self-education, political participation and the abolition of censorship. Unlike many other rock musicians of his generation, he personally disapproved of drugs but supported their decriminalization and regulation.