Sturken and Cartwright claim that "postmodern styles have emerged...through a redefinition of authorship and the relationship of production, distribution, and consumption that has been enabled by changing technologies and new cultural practices" (334). Various media texts exhibit postmodernism by disregarding "modern" marketing and copyrighting practices. In this manner, postmodern works are able to "rely on style for its expression"(335).
Girl Talk is a popular musician widely known for 'borrowing' copyrighted material and mixing popular songs together in order to create hybrid recordings. Like Radiohead's "In Rainbows", these recordings are made available online for fans at a price that they determine.
Here are a couple of his songs - the videos are fan-made but are pretty well done...
Anyways, you get the idea, but overall, Girl Talk exhibits postmodernism not only because of his distribution tactics, but also through using the strategy of pastiche, in which artists incorporate other texts into their own work to the point of legal complication. If anything, he is quite literally an example of the "remix culture", which is propelled by postmodern thought.