Question: What song co-written by Sia was performed by Tokio Myers on Britain's Got Talent in semi-final 3?

Context paragraphs:
Canada's Got Talent: Canada's Got Talent is a Canadian reality talent show series that debuted on the Citytv network on March 4, 2012, and part of the global "Got Talent" franchise.  The logo used for "Canada's Got Talent" does not follow the logo from "America's Got Talent", but instead follows the logo from "Britain's Got Talent".

Diamonds (Rihanna song): "Diamonds" is a song recorded by Barbadian singer Rihanna for her seventh studio album, "Unapologetic" (2012).  It was written by Sia Furler together with its producers, Benny Blanco and StarGate.  The song premiered on September 26, 2012, during the "Elvis Duran and the Morning Show" and was digitally released the following day as the lead single from "Unapologetic".  Def Jam Recordings serviced the single to contemporary hit radio in the United States on October 2.  "Diamonds" is a mid-tempo pop, electronic and R&B ballad that features heavy synthesizers, orchestral sounds and electronic rhythms.  The song's lyrics serve as a departure from the themes of unhealthy relationships that were on Rihanna's previous singles and contain a prominent concept of love.

Got Talent Portugal (season 5): Got Talent Portugal (season 5) was the 5th season of the talent show Got Talent Portugal, Portuguese version of the hit got talent show Britain's Got Talent.  Each judge can press the golden buzzer once in the auditions same as last year, such as the hosts.  This year a new rule was made, the judges can give a unanimous golden buzzer that means the 3 judges can press the buzzer at the same time.

India's Got Talent: India's Got Talent (sometimes abbreviated as IGT) is an Indian reality television series on Colors television network, founded by Sakib Zakir Ahmed and part of the global British "Got Talent" franchise.  It is a cooperative effort between Colors and Britain's FremantleMedia.  The first episode of "India's Got Talent" premiered on 27 June 2009.  "India's Got Talent" follows the global "Got Talent" format, in which contestants audition in front of three judges and a studio audience.  Up until the semifinal and final rounds, the judges decide whether or not a contestant advances in the competition.  During the semifinal and final rounds, viewers vote on which contestants will advance.

Alex Magala: Alexandr Magala (born 24 June 1989 in Orhei) is a Moldovan entertainer and sword swallower who won "Russia's Got Talent" in 2014.  He was also a finalist on "Britain's Got Talent" and "Italia's Got Talent", a semi-finalist on "Ukraine's Got Talent", and a quarter-finalist on "America's Got Talent."

Talento Argentino: Talento Argentino is a television show, led by Mariano Peluffo, which airs on the Telefé channel.  It is based on the English-format "Got Talent" series, which takes place simultaneously in other countries, such as "Britain's Got Talent" in Great Britain, "America's Got Talent" in the United States or "Got Talent", the Spanish version.

Got Talent Portugal (season 4): Season 4 of the got talent show got talent Portugal, Portuguese version of the hit got talent show Britain's got talent.

Tokio Myers: Torville Jones, better known by his stage name Tokio Myers, is a pianist and music producer born in London.  He won reality show "Britain's Got Talent" in 2017 playing Debussy's "Clair de lune", which turned into Ed Sheeran's song "Bloodstream"; Rihanna's "Diamonds" in semi-final 3; and in the final Hans Zimmer's Interstellar Theme soundtrack and Rag'n'Bone Man’s hit "Human".

Česko Slovensko má talent: Česko Slovensko má talent ("Czechia Slovakia's Got Talent" or "Czecho Slovakia's Got Talent") is a Czech and Slovak televised talent show competition which started in August 2010 and originated from the "Got Talent" franchise.  The show is a Thames production (formerly Talkback Thames) distributed by FremantleMedia and is produced in association with Syco TV.  The show is broadcast on TV JOJ and Prima family.  Anyone of any age with any sort of talent can audition for the show.  Acts compete against each other to gain audience support while trying to become "the winner of "Czecho Slovakia's Got Talent"".

Britain's Got Talent: Britain's Got Talent (often shortened to BGT) is a British television talent show competition, and is part of the "Got Talent" franchise.  Produced by both Thames (formerly Talkback Thames) and Syco Entertainment production, and distributed by FremantleMedia, it has been broadcast on ITV since June 2007, and is hosted by Ant & Dec, with each series accompanied by a sister show on ITV2 entitled Britain's Got More Talent.  Contestants of any any age, who possess some sort of talent, can audition for the show, with their performance judged by a panel of judges; the current lineup consists of the show's creator Simon Cowell, Amanda Holden, Alesha Dixon, and David Walliams.  Those that make it through the auditions, compete against other acts in a series of live semi-finals, with the winning two acts of each semi-final proceeding into the show's live final.  The prize for winning the contest is a cash prize (the amount varying over the show's history), and an opportunity to perform at the Royal Variety Performance in front of members of the British Royal Family, including either Queen Elizabeth II or the Prince of Wales.  To date, the show has had eleven winners, ranging from musicians and singers, to variety acts, magicians and dancers.

Supporting paragraphs: Tokio Myers Diamonds (Rihanna song)
Answer: Diamonds