When Brahms did it, it was art. When Negativland did it, it was funny. (And when 2 Live Crew did it to Roy Orbison, in a way, it was artfully funny.) But when Girl Talk's Gregg Gillis plunders the entirety of recorded popular music and emerges with the perfect riff x to complement just the right lick y, somehow it's a borderline illegal calculus.
