Rubin helped popularize hip hop by producing records for pioneering acts such as LL Cool J, the Beastie Boys, Run-DMC, Public Enemy and Geto Boys. He has also produced hit records for acts from a variety of other genres, such as pop (Kesha, Adele, Ed Sheeran, Lady Gaga), heavy metal (Danzig, Metallica, Slayer), alternative rock (The Cult, Red Hot Chili Peppers, Rage Against the Machine, the Strokes, Weezer), hard rock (Audioslave, AC/DC, Aerosmith), nu metal (Linkin Park, System of a Down, Slipknot), and country (Johnny Cash, The Avett Brothers, the Chicks, Tyler Childers). He also worked with Kid Rock in 2010 for his album Born Free. In 2007, Rubin was called "the most important producer of the last 20 years" by MTV[2] and was named on Time's 2007 list of the "100 Most Influential People in the World".[3