Question: Which musical artist is in a duo with the American rapper who released the single "Rock City?"

Context paragraphs:
I Bet (Ciara song): "I Bet" is a song by American singer Ciara from her sixth studio album, "Jackie" (2015).  Released as the lead single from the album by Epic Records on January 26, 2015, "I Bet" serves as Ciara's first single following the birth of her first child and widely publicized break-up with American rapper Future.  The song was written by the singer, Harmony "H-Money" Samuels and Timothy and Theron Thomas of the production duo Rock City.  It was produced by Samuels, and Chris "TEK" O'Ryan was responsible for its vocal production.

Rock City (song): "Rock City" is a song by American rapper Royce da 5'9", released as the third single from his debut album, "Rock City (Version 2.0)", which was released in 2002 through E1 Music (formerly "Koch Records") and Game Recordings, after another record label had turned down his first version of the album.  The song also features vocals from rapper Eminem, becoming Eminem's debut appearance on one of Royce's solo albums.  The single was released on January 5, 2002, the same date as its same titled album was released.  "Rock City" charted at #99 on the Hot R&B/Hip-Hop Singles & Tracks chart in 2002.  Not counting Bad Meets Evil or Slaughterhouse songs, "Rock City" is Royce da 5'9"'s most successful single chart-wise.

No Limit (Usher song): "No Limit" is a song by American singer Usher, featuring American rapper Young Thug.  It was released by RCA on June 9, 2016, for online streaming through the streaming service Tidal, which Usher co-owns.  The following day it was released for paid purchase on other digital download and online streaming services. "No Limit" serves as the lead single off his eighth studio album, "Hard II Love".  The song was written by Usher, Rock City, Young Thug, Brandon "B.A.M." Hodge, Christopher"Talent" Perry, while production was handled by the latter three.  The track gives reference to Master P's song, "Make 'Em Say Uhh", from his 1997 No Limit Records release "Ghetto D" singing, "Make you say uh, no limit / Got that Master P, no limit baby" In North America, the song reached number 32 on the US "Billboard" Hot 100 chart, number nine on the  Hot R&B/Hip-Hop Songs chart.

El Producto (EP): El Producto is the debut extended play (EP) by Australian electronic music group The Avalanches.  It was released on 8 December 1997 via Wondergram Records and distributed by Shock Records.  "El Producto" was the second release by the group and included their debut single, "Rock City", which had appeared on Trifekta Records two months prior.  "Rock City" was the only single released from the EP, the band had "started performing widely and attracted a long term recording deal".  Based on the EP's success, Steve Pavlovic, head of Wondergram Records, signed the group to his new Modular Recordings label in May 1998.  They also signed with Rex Records for the exclusive United Kingdom four-track EP "Undersea Community", which appeared in March 1999.  They released their full-length debut album, "Since I Left You", on Modular in November 2000.

Boom (Royce da 5'9&quot; song): "Boom" is a song and the first single from rapper Royce da 5'9"'s debut studio album Rock City (Version 2.0) which was released in 2002 through E1 Music (formerly "Koch Records) and Game Recordings after another record label had turned down his first version of the album.  The single however was released on December 14, 1999, in CD and vinyl form.  "Boom" was Royce's first single as a solo artist and was the source of him gaining underground notability as a rap artist.

Year of the Lover: "Year of the Lover" is a song by American R&B recording artist Lloyd, released as the third and final single from his third studio album "Lessons in Love" (2008).  The song was produced by Eric Hudson and written by Rico Love.  It was sent to U.S. radio stations on July 10, 2009.  The single was only released in the United States, where it only reached #101 on "Billboard" Hot R&B/Hip-Hop Songs chart.  Although the song was a favorite among many, the single lacked promotion and didn't receive a music video.  The single version features rapper Plies.  Both Plies and Fabolous was featured on the song in "Lessons in Love 2.0".  Other remixes come from Rock City.

Rock City (duo): Rock City is an American musical duo formed in 2003, from Saint Thomas, U.S. Virgin Islands.  The duo consists of brothers Theron and Timothy Thomas, who use the stage names Uptown AP and A.I. respectively.  They are also a songwriting and record production team.  The duo have also released music under the names R. City and Planet VI.  Their debut album, "What Dreams Are Made Of", was released in 2015.  They are known for the single "Locked Away" featuring Adam Levine.

Singing in the Rain (Simple Plan song): "Singing in the Rain" is a song by Canadian rock band Simple Plan from their fifth studio album, "Taking One for the Team" (2016).  On the album, American musical duo Rock City are featured on the track, with an additional verse written by the duo's Timothy and Theron Thomas, however the single version does not include this feature.  The solo Simple Plan version of "Singing in the Rain" was released to digital retailers on March 25, 2016 as the album's third official single.

Rock City discography: The discography of Rock City (also known as R. City and Planet VI)—a songwriting and record production duo from Saint Thomas, U.S. Virgin Islands—consists of one studio album, 16 mixtapes, eight singles (including four as a featured artist) and 21 music videos. Rock City is primarily known for their songwriting and production, having written or produced songs such as "Pour It Up" by Rihanna, "Replay" by Iyaz, "Bow Down/I Been On" by Beyoncé and "We Can't Stop" by Miley Cyrus.  Many albums that Rock City has contributed to have won or been nominated for Grammy Awards.  For instance, the duo wrote "If This Isn't Love" on Jennifer Hudson's Grammy Award-winning self-titled album.

Bad Meets Evil: Bad Meets Evil is an American hip hop duo composed of Detroit-based rappers, Royce da 5'9" (Bad) and Eminem (Evil).  Bad Meets Evil was formed in 1997, thanks to the duo's mutual friend, Proof.  Their discography consists of one extended play (EP) and four singles.  In 1999, the duo released a double non-album single, "Nuttin' to Do" and "Scary Movies"; the former peaked at 36 on the Hot Rap Songs chart, while the latter peaked at 63 on the UK Singles Chart, and was featured on the soundtrack of the 2000 horror comedy parody film "Scary Movie".

Supporting paragraphs: Rock City (song) Bad Meets Evil
Answer: Eminem