Question: Zimbabwean singer/songwriter and member of the band Door Policy, Takura, co-wrote the song "Wait Your Turn" in 2009 for what singer's fourth studio album Rated R?
Context: "Russian Roulette" is a song recorded by Barbadian singer Rihanna for her fourth studio album, "Rated R" (2009).  It premiered on radio stations worldwide on October 20, 2009 and was released as the album's lead single on October 27 through Def Jam Recordings.  Written and produced by Ne-Yo and Chuck Harmony, "Russian Roulette" is a pop and R&B ballad that contains dark, morbid, and tense atmospheric elements in its composition.  Lyrically, the single is about an abusive romantic relationship that ended abruptly.  Music critics noted the lyrical theme as a response to the domestic violence case between Rihanna and her then-boyfriend, singer Chris Brown. Takura Tendayi is a Zimbabwean singer/songwriter and member of the band Door Policy alongside producer Bibby Jones.  He is well known for his frequent collaborations with Chase & Status and Sub Focus, as well as many other dubstep and drum and bass artists.  His guest appearances have accumulated over seventeen million YouTube views, and "Flashing Lights" has charted in the United Kingdom at number 98 in the UK Singles Chart and number 15 in the UK Dance Chart.  shared stage with Ray Cee and also co-wrote Rihanna's 2009 single "Wait Your Turn" which alone has over seventeen million YouTube views and charted at number 45 in the UK Singles Chart.  On 10 September, Door Policy released the three-track EP "No Cover Charge" for free download.  It features a guest appearance from "Traktor" singer L Marshall. "Cold Case Love" is a song recorded by Barbadian singer Rihanna for her fourth studio album, "Rated R" (2009).  It was written and produced by The Y's (Justin Timberlake, Robin Tadross and James Fauntleroy II).  Following Chris Brown's assault on Rihanna, she started working on the sound of her new album.  Timberlake who co-wrote "Cold Case Love" labeled the sound of Rihanna's new project as a step forward for the singer.  In February 2010, Rihanna admitted that the song's lyrics are about her complicated relationship with Brown. "Stupid in Love" is a song recorded by Barbadian singer Rihanna for her fourth studio album, "Rated R" (2009).  The song was written by Shaffer Smith, Mikkel S. Eriksen and Tor Erik Hermansen, with production helmed by StarGate.  Ne-Yo served as the assistant producer.  It was written two days before Rihanna and then boyfriend Chris Brown's altercation on the night of the 2009 Grammy Awards, which occurred on February 8, 2009.  The lyrical content, which describes an abusive relationship, led Ne-Yo to describe the song as a "premonition". Rated R: Remixed (stylized as Rated R /// Remixed) is the second remix album by Barbadian singer Rihanna.  It was released on May 8, 2010, in Brazil and Europe and on May 24, 2010, in the United States by Def Jam Recordings.  It contains remixes from her fourth studio album, "Rated R" (2009).  The songs were solely remixed by Chew Fu.  The majority of the remixes were remastered to incorporate influences from the genre of house music, and incorporate heavy usage of synthesizers as part of their instrumentation. "Wait Your Turn" is a song recorded by Barbadian singer Rihanna for her fourth studio album, "Rated R" (2009).  It was written by Mikkel S. Eriksen, Tor Erik Hermansen, Saul Milton, Will Kennard, James Fauntleroy II, Takura Tendayi, and Rihanna herself.  Stargate (Eriksen and Hermansen) and Chase & Status (Milton and Kennard) produced the song.  "Wait Your Turn" was released on November 13, 2009 as the second international and third overall single from "Rated R". Rated R (also called R or Rated X on vinyl) is the second studio album by American rock band Queens of the Stone Age, released on June 6, 2000 on Interscope Records.  "Rated R" was a critical and commercial success and became the band's breakthrough album.  It peaked at number 16 on the Top Heatseekers and reached high positions on charts worldwide.  The album has been certified gold in the United Kingdom.  Three singles were released from it: "The Lost Art of Keeping a Secret", "Feel Good Hit of the Summer" and "Monsters in the Parasol", with the first helping Queens of the Stone Age reach mainstream popularity. Rated R is the fourth studio album by Barbadian singer Rihanna.  It was released on November 20, 2009 by Def Jam Recordings and SRP Records.  Recording sessions for the album began in April 2009 and took place at several recording studios throughout United States and Europe.  Rihanna, together with Antonio "L.A." Reid and The Carter Administration, was the executive producer of the album and worked with various record producers, including Chase & Status, StarGate, The-Dream, Ne-Yo, and Brian Kennedy.  The record featured several vocalists and instrumentalists, including Young Jeezy, will.i.am, Justin Timberlake and Slash, who played the guitars in "Rockstar 101". "Rude Boy" is a song by Barbadian singer Rihanna, taken from her fourth studio album, "Rated R" (2009).  It was released as the album's third single on February 19, 2010, through Def Jam.  Rihanna co-wrote the song with StarGate, Ester Dean, Makeba Riddick, and Rob Swire, with Swire also co-producing it with StarGate.  "Rude Boy" is an up-tempo dancehall and R&B song which incorporates elements of raggamuffin.  The song received mixed to positive reviews from critics; some called it is the highlight of the album, but others criticized Rihanna's "monotone" and "icy" vocal performance. "Hard" is a song by Barbadian recording artist Rihanna from her fourth studio album, "Rated R" (2009).  The song features a guest verse from American rapper Young Jeezy, credited only as "Jeezy" on the album.  The artists co-wrote the song with its producers, The-Dream and Tricky Stewart.  "Hard" was sent to radio by Def Jam Recordings on November 10, 2009, as the second United States single from "Rated R".  It is a hip hop song and features military horns, hissing synthesizers, sharp beats and piano chords.
Answer: Rihanna