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Another chief influence on the development of art pop was the Pop art movement. The term "pop art", first coined to describe the aesthetic value of mass-produced goods, was directly applicable to the contemporary phenomenon of rock and roll (including Elvis Presley, an early Pop art icon). According to Frith: "[Pop art] turned out to signal the end of Romanticism, to be an art without artists. Progressive rock was the bohemians' last bet ... In this context the key Pop art theorist was not [Richard] Hamilton or any of the other British artists who, for all their interest in the mass market, remained its academic admirers only, but Andy Warhol. For Warhol the significant issue wasn't the relative merits of 'high' and 'low' art but the relationship between "all" art and 'commerce'." Warhol's Factory house band the Velvet Underground was an American group who emulated Warhol's art/pop synthesis, echoing his emphasis on simplicity, and pioneering a modernist avant-garde approach to art rock that ignored the conventional hierarchies of artistic representation.