 In the rock music of the 1970s, the "art" descriptor was generally understood to mean "aggressively avant-garde" or "pretentiously progressive".Post-punk artists from the late 1970s rejected traditional rock sensibilities in favor of an avant-garde aesthetic.Whereas the avant-garde has a significant history in 20th-century music, it is more pronounced in theatre and performance art, and often in conjunction with music and sound design innovations, as well as developments in visual media design.