 After, the genre would be infused within later popular music genres of the 1970s–90s.Critic John Rockwell says that art rock is one of rock's most wide-ranging and eclectic genres with its overt sense of creative detachment, classical music pretensions, and experimental, avant-garde proclivities.In the rock music of the 1970s, the "art" descriptor was generally understood to mean "aggressively avant-garde" or "pretentiously progressive".