Bowie , has been a major figure in the world of popular music for over four decades, and is renowned as an innovator, particularly for his work in the 1970s. Bowie's impact at that time, as described by biographer David Buckley, "challenged the core belief of the rock music of its day" and "created perhaps the biggest cult in popular culture. David Buckley says of Bowie: "His influence has been unique in popular culture—he has permeated and altered more lives than any comparable figure.