Marshall Bruce Mathers III (born October 17, 1972), known professionally as Eminem (often stylized as EMIN3M), is an American rapper, songwriter, record producer, record executive, and actor. Eminem is the best-selling artist of the 2000s in the United States. Throughout his career, he has had 10 number-one albums on the Billboard 200 and five number-one singles on the Billboard Hot 100. With 47.4 million albums sold in the US and 220 million records globally, he is among the world's best-selling artists of all time.

Eminem attracted more attention when he developed Slim Shady, a sadistic, violent alter ego. The character allowed him to express his anger with lyrics about drugs, rape, and murder. In the spring of 1997 he recorded his debut EP, the Slim Shady EP, which was released that winter by Web Entertainment. The EP, with frequent references to drug use, sexual acts, mental instability and violence, also explored the more-serious themes of dealing with poverty and marital and family difficulties and revealed his direct, self-deprecating response to criticism. Hip-hop magazine The Source featured Eminem in its "Unsigned Hype" column in March 1998.  After he was evicted from his home, Eminem went to Los Angeles to compete in the 1997 Rap Olympics, an annual, nationwide battle rap competition. He placed second, and Interscope Records staff in attendance sent a copy of the Slim Shady EP to company CEO Jimmy Iovine. Iovine played the tape for record producer Dr. Dre, founder of Aftermath Entertainment and founding member of hip-hop group N.W.A. Dre recalled, "In my entire career in the music industry, I have never found anything from a demo tape or a CD. When Jimmy played this, I said, 'Find him. Now.'" Although his associates criticized him for hiring a white rapper, he was confident in his decision: "I don't give a fuck if you're purple; if you can kick it, I'm working with you." Eminem had idolized Dre since listening to N.W.A. as a teenager, and was nervous about working with him on an album: "I didn't want to be starstruck or kiss his ass too much ... I'm just a little white boy from Detroit. I had never seen stars, let alone Dr. Dre." He became more comfortable working with Dre after a series of productive recording sessions.  Eminem released The Slim Shady LP in February 1999. Although it was one of the year's most popular albums (certified triple platinum by the end of the year), he was accused of imitating the style and subject matter of underground rapper Cage. The album's popularity was accompanied by controversy over its lyrics; in "'97 Bonnie and Clyde" Eminem describes a trip with his infant daughter when he disposes of his wife's body, and in "Guilty Conscience" which encourages a man to murder his wife and her lover. "Guilty Conscience" marked the beginning of a friendship and musical bond between Dr. Dre and Eminem. The label-mates later collaborated on a number of hit songs ("Forgot About Dre" and "What's the Difference" from Dr. Dre's album 2001, "Bitch Please II" from The Marshall Mathers LP, "Say What You Say" from The Eminem Show, "Encore/Curtains Down" from Encore, and "Old Time's Sake" and "Crack a Bottle" from Relapse), and Dre made at least one guest appearance on each of Eminem's Aftermath albums. The Slim Shady LP has been certified quadruple platinum by the RIAA.  Eminem appeared on his Shade 45 Sirius channel in September 2008, saying: "Right now I'm kinda just concentrating on my own stuff, for right now and just banging out tracks and producing a lot of stuff. You know, the more I keep producing the better it seems like I get 'cause I just start knowing stuff." Interscope confirmed that a new album would be released in spring 2009. In December 2008, Eminem provided more details about the album, entitled Relapse: "Me and Dre are back in the lab like the old days, man. Dre will end up producing the majority of the tracks on 'Relapse'. We are up to our old mischievous ways ... let's just leave it at that."  According to a March 5, 2009 press release, Eminem would release two new albums that year. Relapse, the first, was released on May 19; its first single and music video, "We Made You", had been released on April 7. Although Relapse did not sell as well as Eminem's previous albums and received mixed reviews, it was a commercial success and re-established his presence in the hip-hop world. It sold more than five million copies worldwide. During the 2009 MTV Movie Awards, Sacha Baron Cohen descended on the audience in an angel costume. He landed buttocks-first on Eminem, who stormed out of the ceremony; three days later, Eminem said that the stunt had been staged. On October 30 he headlined at the Voodoo Experience in New Orleans, his first full performance of the year. Eminem's act included several songs from Relapse, many of his older hits and an appearance by D12. On November 19, he announced on his website that Relapse: Refill would be released on December 21. The album was a re-release of Relapse with seven bonus tracks, including "Forever" and "Taking My Ball". Eminem described the CD:  I want to deliver more material for the fans this year like I originally planned ... Hopefully these tracks on The Refill will tide the fans over until we put out Relapse 2 next year ... I got back in with Dre and then a few more producers, including Just Blaze, and went in a completely different direction which made me start from scratch. The new tracks started to sound very different than the tracks I originally intended to be on Relapse 2, but I still want the other stuff to be heard.  In the summer of 2014, Eminem and Rosenberg began using the hashtag #SHADYXV on social networking sites, and Eminem wore a T-shirt with the hashtag onstage. This was later revealed to be the name of an upcoming Shady Records compilation. Shortly afterwards the first single from the album ("Guts Over Fear", featuring singer-songwriter Sia Furler) was released and the album's track list was released on October 29. Shady Records released a cypher to promote the album, in which Eminem did a seven-minute freestyle. "Detroit Vs. Everybody" (the album's second single), with Eminem, Dej Loaf, Royce da 5'9", Danny Brown, Big Sean and Trick-Trick, was released on November 11. Shady XV, released on November 24 during Black Friday week, consists of one greatest-hits disc and one disc of new material by Shady Records artists such as D12, Slaughterhouse, Bad Meets Evil and Yelawolf. The album debuted at number three on the Billboard 200 chart, with first-week sales of 138,000 copies in the United States.  The Official Eminem Box Set, a career-spanning, 10-disc vinyl box set, was released on March 12, 2015. The set includes seven of Eminem's eight studio albums (excluding Infinite), the 8 Mile soundtrack, the compilation Eminem Presents: The Re-Up, and the greatest hits collection Curtain Call: The Hits. Early in the year, it was announced that he would appear on Tech N9ne's "Speedom (Worldwide Choppers 2)". The song, also featuring Krizz Kaliko, was released on April 20. Eminem also appeared on Yelawolf's "Best Friend", the single from Love Story.  Eminem is the executive producer of the soundtrack on the sports drama Southpaw, with Shady Records. The first single from the soundtrack called 'Phenomenal' was released on June 2, 2015. Another single, "Kings Never Die" by Eminem featuring Gwen Stefani, was released on July 10, 2015 on YouTube via Eminem's Vevo account. Eminem was the first interview of Zane Lowe in Beats 1. The interview streamed online on the Beats 1 radio on  July 1, 2015. Eminem appeared on the public access show Only in Monroe, produced in Monroe, Michigan, and was interviewed by guest host Stephen Colbert for an episode that aired July 1, 2015. In the episode Eminem sang snippets of Bob Seger songs at Colbert's prompting and briefly discussed Southpaw. In June 2015, it was revealed that he will serve as the executive producer and music supervisor on the TV series Motor City whose premise will be based upon the 2002 film Narc.  In September 2016, Eminem was featured on Skylar Grey's song, "Kill For You", which appears on her album, Natural Causes. On October 19, 2016, Eminem released a new song called "Campaign Speech", a political hip hop song, and announced he was working on a new album. On November 17, 2016, Eminem released a remastered version of 'Infinite' on his YouTube VEVO channel. On November 22, 2016, Eminem released a trailer for a 10-minute short documentary called Partners in Rhyme: The True Story of Infinite.

Using a quote from the above article, answer the following question: What is Southpaw?
Eminem is the executive producer of the soundtrack on the sports drama Southpaw, with Shady Records.