Alice Cooper, "What Baby Wants" (2011)
Kesha is best known for her hip-hop-leaning EDM-pop hybrid, but the singer has a rock & roll side that came through on a collaboration with Alice Cooper on his 2011 album Welcome 2 My Nightmare. "I met [Kesha] at the Grammys," Cooper told Billboard. "I immediately looked at her and went, 'This girl is not a pop diva. She's a rock singer.' She would much rather be the female Robert Plant than the next Britney Spears. [Bob Ezrin] said, 'Nobody's gonna expect Kesha on your album.' 'Great! Let's do it!'" On Warrior, Kesha's 2012 album, she worked with other members of the rock elite, such as the Black Keys' Patrick Carney, the Flaming Lips and even Iggy Pop.