Peter Graham Scott (27 October 1923 – 5 August 2007) was an English film producer, film director, film editor and screenwriter.
 One of the producers and directors who shaped British television drama in its formative years, Scott brought a background in film editing and directing to his work that helped to move the small screen out of an era of lifeless, studio-bound productions and towards programmes that owed more to cinema than to the stage.
Jaycen Joshua is a mix engineer who works at Larrabee Sound Studios in North Hollywood, California.
 Joshua started his mix career in 2006 when he became partners with his mentor Dave Pensado and formed The Penua Project.
 Joshua has won multiple Grammys and mixed many Grammy Award winning records such as "Single Ladies (Put a Ring on It)" by Beyoncé and "Blame It" by Jamie Foxx, as well as over 60 #1 singles and albums.
 Joshua has worked with Mariah Carey, Justin Timberlake, Sean Combs, Jay-Z, Chris Brown, Miley Cyrus, Christina Aguilera, Mary J. Blige, Rihanna, R. Kelly, Celine Dion, J-Lo, T.I., Usher, Michael Jackson, Nicki Minaj, Katy Perry, Snoop Dogg, Justin Bieber, Seal, Nas, Chris Brown and Whitney Houston.
 Joshua is managed by Terry Ross for Innersound Management, LLC.
Robert Glasper (born April 6, 1978, in Houston, Texas) is an American pianist and record producer.
 He has been nominated for 6 Grammys, has won 3 Grammy Awards and is currently nominated for an Emmy Award.
 His 2012 album "Black Radio" won the Grammy Award for Best R&B Album at the 55th Grammy Awards.
 His 2014 album "Black Radio 2" won the Grammy Award for Best Traditional R&B Performance at the 56th Grammy Awards.
 The song "These Walls" from Kendrick Lamar's album "To Pimp A Butterfly" won Best Rap/Sung Collaboration at the 57th Grammy Awards, on which Glasper plays keys.
 The soundtrack for the film "Miles Ahead" won Best Soundtrack Compilation at the 58th Grammy Awards, for which Glasper was a producer.
 The song "Letter To The Free", written with Common, is nominated for an Emmy Award for Best Original Song in the Ava Duvernay documentary film "13th" (Netflix) at the 2017 Emmys.
Paul Richard Epworth (born 25 July 1974 in Bishop's Stortford, Hertfordshire) is an English music producer, musician, and songwriter.
 His production and writing credits include Adele, Rihanna, and Maxïmo Park amongst many others.
 On 12 February 2012 at the 54th Grammy Awards, Epworth won four Grammy Awards for Producer of the Year, Album of the Year (Adele's "21"), and Song of the Year and Record of the Year (for "Rolling in the Deep").
 He won the Academy Award for Best Original Song alongside Adele, for "Skyfall".
 His sister Mary Epworth is a singer and songwriter.
 He is a member of the Music Producers Guild.
 He also has a record label, Wolf Tone, whose artists include Glass Animals, Rosie Lowe and Plaitum.
 He has won 'Producer of the Year' at the BRIT Awards three times, the most recent in 2015.
 At the 59th Grammy Awards in 2017, Epworth won a Grammy for Album of the Year for his work on Adele's 25".
Gordon Goodwin's Big Phat Band, or simply The Big Phat Band, is an 18-piece jazz orchestra that combines the big band swing of the 1930s and 1940s with contemporary music such as funk and jazz fusion.
 The band is led by Gordon Goodwin, who arranges, composes, plays piano and saxophone.
 Since its origin, the Big Phat Band has received several Grammy Awards and many Grammy nominations.
Marilyn Horne (born January 16, 1934) is an American mezzo-soprano opera singer.
 She specialized in roles requiring a large sound, beauty of tone, excellent breath support, and the ability to execute difficult coloratura passages.
 She is a recipient of the National Medal of Arts (1992) and the Kennedy Center Honors (1995).
 She has won four Grammy Awards.
Michael Scott is the founder of the London Opera Society.
 In his role as the society's sole artistic director, he brought to London Marilyn Horne, Joan Sutherland, and Boris Christoff.
 He was also responsible for introducing Sherrill Milnes, Ruggero Raimondi, and Montserrat Caballe.
 He is a highly regarded expert in the field of opera with an extensive knowledge of the history of vocal music, and his books include volumes 1 and 2 of "The Record of Singing" and "The Great Caruso".
 In 1992, he also wrote "Maria Meneghini Callas", being one of the few Maria Callas biographers to have seen her frequently on stage in her prime.
 He is a frequent contributor to "Opera News".
Charles Chalmers is a saxophonist, session musician, backup singer, songwriter and producer.
 He has written several hit songs for many recording artists, and has also arranged & performed on many grammy winning recordings.
 Seven of those recordings are in the Grammy Hall of Fame : Al Green's "Let's Stay together"; Aretha Franklin's "Respect," "Chain of Fools" & "Natural Woman"; Dusty Springfield's "Son of a Preacher Man"; and Wilson Pickett's "Mustang Sally" and "Land of a Thousand Dances."
 He also holds an Album of the Century award for his work on Aretha Franklin's, "I Ain't Never Loved a Man the Way that I Love You."
Circo is a band from Puerto Rico which formed in 2001.
 Its members are Jose Luis "Fofé" Abreu (vocals), Edgardo "Egui" Santiago (keyboards), José David Pérez (drums, vibes), Nicolás Cordero (bass)(Nico is no longer with the band), and Orlando Méndez (guitar).
 The band was nominated for Rock New Artist at the 16th Lo Nuestro Awards, losing to Mexican singer Alessandra Rosaldo.
 They also have been nominated for various Latin Grammy Awards in Latin Grammy Awards of 2002,Latin Grammy Awards of 2005 and Latin Grammy Awards of 2008.
Scott Tallon Walker is an architecture practice with its head office in Dublin, Ireland and further offices in London, Galway and Cork.
 It is one of the largest architecture practices in Ireland.
 Established in 1931 as Scott and Good, becoming Michael Scott Architect in 1938, and Michael Scott and Partners in 1957 before changing to the current Scott Tallon Walker in 1975.
 Scott Tallon Walker and its earlier incarnations developed a reputation for modernism.

Question: Michael Scott brought to London an aopera singer who has won how many Grammy Awards?
Answer: four