if you disect it enough every medium of expression has preconceived objectives. although we question the artistic merit of some, such as barbie girl, because we frown up on 'low class culture', where as 'high class culture', is still supposed the be the retreat of the vanguard bourgeoise.
frederic jameson, (postmodernism and consumer society) states, that in the modernist society, the dichotomy of high and low culture; imposed a consensus that high culture is absolute and even authoritative. Art is seen as a hard earned field of finished work authenticated by artists and validated by agreed upon with un-spoken standards of this authorative vanguard.
where as in postmodern society, art is process, a performance, production, that is intertextuality (word of the day) dictated by the audience. since today we have CDs, radio, internet, that audience is far larger and the intertextualisation is all the more powerful. art is now more a recycling of culture authenticated by the audience and validated in subcultures sharing identity with the artist.