Question: Stargate is a Norwegian record producing and songwriting team composed of Tor Erik Hermansen, and Mikkel Storleer Eriksen, and have produced and written or only produced for stars including which Australian singer-songwriter, record producer and music video director, and started her career as a singer in the local Adelaide acid jazz band Crisp in the mid-1990s?
Context: "Cannonball" is the debut single by American singer Lea Michele.  The song was released onto iTunes on December 10, 2013 and made its radio debut on "Elvis Duran and the Morning Show" on December 16, 2013.  The song was written by Sia, Benny Blanco, Mikkel Storleer Eriksen, Tor Erik Hermansen and Saud, and was produced by Stargate and Blanco. "Bossy" is a song by American actress and singer-songwriter Lindsay Lohan.  The song was written and produced by Shaffer Smith, known by his stage name Ne-Yo, while additional writing and production was done by Stargate members Mikkel Storleer Eriksen and Tor Erik Hermansen.  After leaking online in the beginning of May 2008, Universal Motown officially released the song to media outlets, while its digital single was released on May 27, 2008.  Musically, "Bossy" is an electropop and dance-pop song.  Lyrically, it is about a woman being strong enough to get what she wants when she wants it. Stargate is a Norwegian record producing and songwriting team composed of Tor Erik Hermansen (born 14 October 1972) and Mikkel Storleer Eriksen (born 10 December 1972), based in Los Angeles, but they were based in New York City for almost a decade.  The team's genres include R&B, pop and hip hop.  Stargate was established in Trondheim, Norway.  They have produced and written or only produced for Britney Spears, Beyoncé, Rihanna, Janet Jackson, Mariah Carey, Shakira, Jennifer Lopez, Mary J. Blige, Katy Perry, Coldplay, P!NK, Sia, Kylie Minogue, Lionel Richie and others. "It's OK!"  is a song by British girl band Atomic Kitten.  It was written by Hallgeir Rustan along with Mikkel Storleer Eriksen and Tor Erik Hermansen from Stargate and recorded for the band's second album "Feels So Good" (2002).  The song was released by Virgin Records as the lead single from the album in May 2002 and became a worldwide commercial success. "Thunder" is a song by English recording artist Jessie J.  It was written by Jessie J, Claude Kelly, Benjamin Levin, Tor Erik Hermansen and Mikkel Storleer Eriksen for her second studio album "Alive" (2013), while production was helmed by StarGate and Benny Blanco. Sia Kate Isobelle Furler ( ; born 18 December 1975) is an Australian singer-songwriter, record producer and music video director.  She started her career as a singer in the local Adelaide acid jazz band Crisp in the mid-1990s.  In 1997, when Crisp disbanded, she released her debut studio album titled "OnlySee" in Australia.  She then moved to London, England, and provided lead vocals for the British duo Zero 7. "If I Was Your Man" is a song by American recording artist Joe.  It was written by Mikkel Storleer Eriksen and Tor Erik Hermansen along with Phillip Lamont Jackson for his sixth studio album "Ain't Nothin' Like Me" (2007), with production handled by the former two for Stargate.  The contemporary R&B ballad was selected as the album's second single and released to US radios on July 13, 2007.  It peaked at number 84 on the "Billboard" Hot 100 and reached the top forty of the Hot R&B/Hip-Hop Songs chart.  The song's accompanying music video features a cameo appearance by actor Blair Underwood and was inspired by the ending scene of the film "Casablanca" as his love interest leaves Joe for the man in the plane. "Telepathy" is a song recorded by American singer and songwriter Christina Aguilera for the 2016 Netflix musical drama series "The Get Down", included on the accompanying soundtrack of the same name.  It features American musician Nile Rodgers, and was co-written by Sia Furler in collaboration with Mikkel Storleer Eriksen and Tor Erik Hermansen.  The track was produced by Elliott Wheeler and "The Get Down" director, Baz Luhrmann.  While it was available to download from the soundtrack upon its release, it was promoted in Italy to contemporary hit radio as a single on August 23, 2016.  Various remixes were also released throughout the following month. "No Vacancy" is a song by American pop rock band OneRepublic.  It was released as a single via digital download on April 28, 2017.  It was written by band members Ryan Tedder, Brent Kutzle, Drew Brown, and Zach Filkins, as well as Tor Erik Hermansen and Mikkel Storleer Eriksen from the Norwegian production and songwriting duo Stargate.  The song was co-produced by Stargate and Tedder. "The Last Goodbye" is a song by British girl group Atomic Kitten.  It was composed by Daniel Poku, Espen Lind, Mikkel Storleer Eriksen, Tor Erik Hermansen, Hallgeir Rustan, and Peter Björkl and produced by Stargate for the band's second album "Feels So Good" (2002).  The pop ballad was released as the third single from the album in 2003; in Ireland and the United Kingdom it was released as a double A-side with "Be with You".  The song peaked at number two on the UK Singles Chart in December of that year.
Answer: Sia