Ke$ha, "Dirty Love" (2012)
Ke$ha flaunted her rock side on second album Warrior, and "Dirty Love" was one of her victories. Over a big "Lust for Life"-style beat, she shouts, "It's Iggy Pop!" and he shouts back, "Yeah! And–," then nearly whispers, "Kesha." Iggy's verse is something like a scuzz-punk take on Cole Porters' "Let's Do It," with lines like "Cockroaches do it/In garbage cans" and "Santorum did it/In a v-neck sweater." Unfortunately, Iggy's voice was excised from the version used for the music video, but at least Iggy-worthy lyrics like "Champagne tastes like piss to me" and "Keep your leopard limousine" remain for Ke$ha to sing.