How is the Velvet Underground postmodern?

My answer fwiw, Alex woudl be along these lines: modernist music rejected the forms and melodic structures of historically derived Western music; AW's VU typically blended raucous new soundscapes with almost unbearably sweet and very traditionally melodic songs. It's this 'knowing' kind of incorporation of the traditional pattern of arts over a base material that takes new elements and dissonances entirely for granted that for me characterises quite a lot of music that can be classified post-modern.