Salon investigates the allegation that the music industry is creating bogus mp3s which use popularly searched song titles but contain annoying ads or repeated sound loops. This practice is called "spoofing" and has been around since P2P began.
The RIAA apparently condones this. Its President states it "is completely lawful ... I think it would be crazy if record labels, or motion picture studios or any other owners of content didn't take advantage of those kinds of measures."
Before "spoofing" was blamed on people who hate certain artists like Eminem and want to anger fans who want freebies. The LA Times claims that Interscope has engaged in this practice. However, it seems impossible to determine who "spoofs".