Question: California Gurls was produced in part by a Swedish record producer rose to prominence in the second half of the 1990, after making hits for the Backstreet Boys, Britney Spears, and who?
Context: Karl Martin Sandberg (born 26 February 1971), better known as Max Martin, is a Swedish songwriter, record producer, and singer.  He rose to prominence in the second half of the 1990s after making a string of major hits for artists such as the Backstreet Boys, Britney Spears, and NSYNC.  Some of his earlier hits include "I Want It That Way" (1999), "...Baby One More Time" (1999), and "It's My Life" (2000). The discography of American pop vocal group Backstreet Boys consists of eight studio albums, 28 singles, one live album, three compilation albums and 25 music videos. Formed in Orlando, Florida in 1993, the group consists of Nick Carter, Brian Littrell, Kevin Richardson, A. J. McLean and Howie Dorough.  Richardson left the group in 2006 to pursue other interests, but rejoined in 2012.  The Backstreet Boys released their debut single "We've Got It Goin' On" in 1995, which peaked at number sixty-nine on the "Billboard" Hot 100.  The single, however, entered the top ten in many European countries.  Their debut album, "Backstreet Boys", was released internationally in 1996, and was certified three times platinum in Europe, and diamond in Canada.  In 1997, they released their second international album, "Backstreet's Back", which continued their international success.  At the same time, they released their second self-titled album in the United States.  It peaked at number four and eventually became the tenth best-selling album of the 1990s. Simon Ellis is a producer and musical director who has worked with Britney Spears, the Spice Girls, Westlife, S Club 7 and East 17.  He co-wrote and produced the S Club 7 hits "Don't Stop Movin'", "Two in a Million", "Never Had a Dream Come True" and "Alive".  "Don't Stop Moving" won the Brit Award for Best British Single and the ITV record of the year award in 2001.  During 2008, Ellis was appointed the role of musical director for Britney Spears's The Circus Starring Britney Spears tour in Australia & New Zealand.  During 2011 Ellis was musical director for Spears's Femme Fatale Tour. The Essential Backstreet Boys is the third compilation album by American pop group Backstreet Boys, released by RCA Records and Legacy Recordings as part of their "Essential" series.  It was released on September 26, 2013 in the United Kingdom, and on October 22, 2013 in the United States.  The album includes songs from the group's first seven studio albums, "Backstreet Boys" (1996), "Backstreet's Back" (1997), "Millennium" (1999), "Black & Blue" (2000), "Never Gone" (2005), "Unbreakable" (2007), and "This Is Us" (2009).  It also includes the song "If You Stay" recorded for the 1997 film "Booty Call", and "Drowning" from their first greatest hits compilation, "The Hits – Chapter One" (2001). Jay Orpin (born April 29, 1976 in Stockholm, Sweden ) is a Swedish and Finnish songwriter and producer.  He also writes songs and produced for Backstreet Boys, NSYNC, Robyn, Ace of Base, Bon Jovi, 2gether and Britney Spears, and later he produced songs for Good Charlotte, Sum 41, Simple Plan, Hawthorne Heights, Red Jumpsuit Apparatus, My Chemical Romance, Tokio Hotel, Lindsay Lohan, Dashboard Confessional, All American Rejects, Fall Out Boy, AFI, Evanescence, Hollywood Undead, t.A.T.u., Yellowcard, Hannah Montana, Linkin Park, Bullet for My Valentine and Taking Back Sunday.  Most of his music is under the influence of today's modern pop punk, dance-punk, and emo music, but he does write some pop and hip-hop music as well.  He also teamed up with Travis Barker in 2007, remixing popular hip-hop singles such as Throw Some D's, Party Like a Rockstar, and Crank That Soulja Boy.  Even though he has written some of the works of some of the aforementioned artists, he is not one of the main producers of many of these artists and he chooses not to put his credit for his work.  An original song written by such composer to be cited is yet to be found, however some has claimed an abbreviation of his name in one of the albums.  In late 2008, he has decided to move in a small town near Oulu, Finland to raise his family and is a high school teacher and does accounting for bill paying in the summer to support the family, along with music production projects part-time, but he still continues to produce music today, but not as much as he used to.  He did come back to help write a few new songs, such as In My Head by Jason Derulo.  He has quit his part-time job in accounting to allow more time back in the music production business, to make a revival. Backstreet Boys is the self-titled debut U.S. studio album by the vocal-pop group Backstreet Boys.  The release of this album coincided with the release of their second international album "Backstreet's Back".  Their international debut album released in 1996 was also titled "Backstreet Boys", but it was not released in the United States.  This second self-titled album was released only in the United States in 1997, making it their debut album in the country.  It became one of the most successful debut albums of all time.  The album peaked at number four on the "Billboard" 200 albums chart and has been certified 14× Platinum (Diamond) by the RIAA for sales to retailers, having sold over 14 million copies to date in the United States.  This was also reported as the second highest seller in the past 14 years for Music Club sales back in 2003, selling 1.72 million units. Christian Karlsson, also known by his stage name Bloodshy, is a Swedish record producer, DJ, and remixer known for his work with the musical groups Bloodshy and Avant, Miike Snow, INGRID, and Galantis.  He started his international music career as one half of the electro pop duo Bloodshy & Avant with Pontus Winnberg, producing and co-writing tracks for pop stars such as Madonna, BoA, Kylie Minogue, and Katy Perry.  Bloodshy & Avant notably co-wrote and produced Britney Spears' single "Toxic", which earned them a Grammy Award for Best Dance Recording in 2005.  While continuing to work with Bloodshy and Avant, Karlsson also became a member of the indie pop band Miike Snow around 2007. " Miike Snow", the group's debut album, was released in 2009, and peaked at number 11 on the Top Electronic Albums chart in the United States.  Miike Snow won the 2011 European Border Breakers Award, and their second album "Happy to You" reached No. 1 on the Belgian Heatseekers Albums Chart and 43 on the "Billboard" 200. Playlist: The Very Best of the Backstreet Boys is the second greatest hits album by American vocal group Backstreet Boys, released by Legacy Recordings as part of their "Playlist" series.  This compilation includes songs from the group's first six studio albums, "Backstreet Boys" (1996), "Backstreet's Back" (1997), "Millennium" (1999), "Black & Blue" (2000), "Never Gone" (2005) and "Unbreakable" (2007), and the single "Drowning" from "The Hits – Chapter One" (2001). "California Gurls" is a song recorded by American singer Katy Perry.  It served as the lead single for her third studio album, "Teenage Dream" (2010).  The song features verses from rapper Snoop Dogg.  Both artists co-wrote the song with Bonnie McKee and its co-producers Dr. Luke and Max Martin, with additional production from Benny Blanco.  According to Perry, "California Gurls" is an answer song to "Empire State of Mind" (2009), by Jay-Z and Alicia Keys.  Its midtempo production incorporates disco-pop, and funk-pop with influences of new wave, and electropop.  Its lyrics are an ode to the state of California, in which both Perry and Snoop Dogg were born and raised. Britney Spears: Live and More!  (stylized as britney spears: live and more!)  is the second video album by American recording artist Britney Spears.  It was released on VHS on November 21, 2000 and later re-issued on DVD alongside Spears' first home video release, "Time Out with Britney Spears" on February 13, 2001.  This video tracks Britney Spears on her much-publicized visit to Hawaii for her "Crazy 2K Tour".  Spears, polished and sophisticated beyond her years, tours the island with a mix of sightseeing, fan appearances, and live performances.  The camera follows her as she practices with her dancers, hangs out with friends, and even attempts to hula dance.  The highlight, is the culminating live performance where Britney performs some of her greatest hits like "Oops! ...I Did It Again, "(You Drive Me) Crazy", and "...Baby One More Time".  Although the DVD peaked at number four (#4) in the U.S., the DVD has been certified 3x platinum.  In France the DVD was certified platinum, meaning that it sold over 20,000 copies, and worldwide sold over 500.000 copies.
Answer: NSYNC