rock into his music and has cited rock acts during the 1970s and 1980s, such as Jimi Hendrix and Led Zeppelin, as influences in his music. Alter egos Eminem uses alter egos in his songs for different rapping styles and subject matter. His best-known alter ego, Slim Shady, first appeared on the Slim Shady EP and was in The Slim Shady LP, The Marshall Mathers LP, The Eminem Show, Encore, Relapse, The Marshall Mathers LP 2, Kamikaze and Music to Be Murdered By. In this persona, his songs are violent and dark, with a comic twist. Eminem downplayed Slim Shady on Recovery because he felt it did not fit the album's theme. Another character is Ken Kaniff, a homosexual who pokes fun at Eminem's songs. Ken was created and originally played by fellow Detroit rapper Aristotle on the Slim Shady LP, where Kaniff makes a prank call to Eminem. An argument after the album's release prompted Eminem to use the Kaniff character on Marshall Mathers and later albums (except Encore and Recovery). Aristotle, angry with Eminem's use of his character, released a mixtape in his Kaniff persona ridiculing him. Collaborations and productions Although Eminem usually collaborates with Aftermath Entertainment and Shady Records rappers such as Dr. Dre, 50 Cent, D12, Obie Trice and Yelawolf, he has also worked with Redman, Kid Rock, DMX, Lil Wayne, Missy Elliott, Jay Z, Drake, Rihanna, Nas, Nicki Minaj, Xzibit, Method Man, Jadakiss, Fat Joe, Sticky Fingaz, T.I. and Young Jeezy. Eminem rapped a verse in a live performance of Busta Rhymes' "Touch It" remix at the 2006 BET Music Awards. He appeared on Akon's single "Smack That" from Konvicted, Lil Wayne's hit "Drop the World" and "My Life" (the lead single from 50 Cent's Street King Immortal). Eminem was the executive producer of D12's first two albums (Devil's Night and D12 World), Obie Trice's Cheers and Second Round's on Me and 50 Cent's Get Rich or Die Tryin' and The Massacre. He has produced songs for other rappers such as Jadakiss' "Welcome To D-Block", Jay-Z's "Renegade" and "Moment of Clarity", Lloyd Banks' "On Fire", "Warrior Part 2" and "Hands Up", Tony Yayo's "Drama Setter", Trick-Trick's "Welcome 2 Detroit" and Xzibit's "My Name" and "Don't Approach Me". Most of The Eminem Show was produced by Eminem and his longtime collaborator, Jeff Bass, and Eminem co-produced Encore with Dr. Dre. In 2004, Eminem was co-executive producer