Question: How many Grammy Awards did this American singer-songwriter, multi-instrumentalist, and record producer win who released the album "Diamonds and Pearls?"

Context articles: Diamonds and Pearls
Robert Glasper
James Mallinson
David Frost (producer)
Paul Epworth
Alicia Keys
Jake Sinclair (musician)
Gordon Chambers
Prince (musician)
Dru Castro

Diamonds and Pearls is the thirteenth studio album by American recording artist Prince, and the first with his backing band The New Power Generation.
 It was released on October 1, 1991 by Paisley Park Records and Warner Bros.
 Records.
 The album produced several hit singles, including "Gett Off", "Cream", "Money Don't Matter 2 Night", "Insatiable", and the title track.
 Dancers Lori Werner (then dancing under the stage name of Lori Elle) and Robia LaMorte, known as "Diamond" and "Pearl" respectively, appeared on the holographic cover (re-pressings of the album are non-holographic).
 Diamond and Pearl also appeared in the music videos for "Cream", "Strollin'", "Gett Off", and the title track, and also participated in Prince's Diamonds and Pearls Tour.
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.
James Mallinson is a record producer.
 He was the first winner of the Grammy Award for Producer of the Year, Classical category, and has won a total of 15 Grammy Awards in his career, his most recent Grammy nominations - and wins - having come in 2008 for Best Opera Recording.
 He won his first three Grammy awards in 1979, when he was named Classical Producer of the Year, and won another four in 1982.
 He spent twelve years with the Decca Record Company and became a freelance classical producer in 1984.
 He has worked with all the major record labels and with most leading classical artists.
 In 2000 he was closely involved in the creation of "LSO Live", the London Symphony Orchestra's in house record label and has produced all their releases to date - currently 65 CDs.
David Frost is a record producer and pianist.
 He has won 15 Grammy Awards for his work, most recently in February 2017 for Producer of the Year, Classical.
 In 2014 he won three Grammy's for Producer of the Year, Classical, Best Engineered Album, Classical for Maria Schneider's "Winter Morning Walks" and for Best Classical Vocal Performance for Dawn Upshaw in "Winter Morning Walks".
 In 2012 his production of Steven Mackey's "Lonely Motel" with eighth blackbird and Rinde Eckert won a Grammy Award for Best Small Ensemble Performance.
 In 2011 he won four awards including Producer of the Year, Classical.
 He had won this category in 2005 and 2009 as well.
 In 2009 he also won a Grammy Award for Best Engineered Album, Classical, for "Traditions and Transformations: Sounds of Silk Road Chicago", with Yo-Yo Ma, the Silk Road Ensemble and the Chicago Symphony.
 He has worked with numerous labels, including RCA Red Seal, Sony Classical, London/Decca, Deutsche Grammophon and EMI Classics.
 As a staff producer at BMG Classics (RCA Red Seal) for nearly a decade, he collaborated with many of their most important artists such as André Previn, Sir Colin Davis, Leonard Slatkin, Anne Akiko Meyers, The Tokyo String Quartet, János Starker, Luciano Berio and the pianists Alicia de Larrocha, Evgeny Kissin, Rudolf Firkusny and Van Cliburn.
 He has also been a guest faculty member of The Banff Centre.
 He is the son of Thomas Frost, who won the 1986 Grammy for Classical Producer of the Year.
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".
Alicia Augello Cook (born January 25, 1981), known professionally as Alicia Keys, is an American singer, songwriter, record producer, pianist and actress.
 Keys released her debut album with J Records, having had previous record deals first with Columbia and then Arista Records.
 Keys' debut album, "Songs in A Minor" was released in 2001, producing her first "Billboard" Hot 100 number-one single "Fallin'", and selling over 12 million copies worldwide.
 The album earned Keys five Grammy Awards in 2002.
 Her sophomore album, "The Diary of Alicia Keys", was released in 2003, spawning successful singles "You Don't Know My Name", "If I Ain't Got You" and "Diary", and selling 8 million copies worldwide.
 The duet song "My Boo" with Usher scored her a second number-one single in 2004.
 The album garnered her an additional four Grammy Awards in 2005.
 Later that year, she released her first live album, "Unplugged", becoming the first woman to have an "MTV Unplugged" album debut at number one.
Jake Sinclair (born March 7, 1985) is an American record producer, audio engineer, mixing engineer, multi-instrumentalist, vocalist, and songwriter.
 His production, engineering, songwriting, and mixing credits include Weezer, Fall Out Boy, Panic!
 at the Disco, 5 Seconds of Summer, Pink, New Politics, Andrew McMahon in the Wilderness, Gin Wigmore, and Train.
 Sinclair co-wrote and produced Panic!
 at the Disco's "Death of a Bachelor" album (which debuted at number one on the US Billboard 200) and produced Weezer's 2016 "Weezer (White Album)".
 Both were nominated for Best Rock Album at the 59th Annual Grammy Awards.
 He co-wrote and produced "Uma Thurman" by Fall Out Boy, which debuted at number one on the U.S. iTunes Chart, reached number 22 on the Billboard Hot 100, and was certified 2X Platinum by the RIAA in December 2015.
 Sinclair received a Grammy nomination for Album of the Year for his work as engineer and bassist on Taylor Swift's "Everything Has Changed" alongside producer Butch Walker.
 He co-wrote and produced the debut single, "She Looks So Perfect" by 5 Seconds of Summer that peaked at number one in over five countries and won "Song of the Year" at the 2014 ARIA Awards.
 Sinclair is the former bassist of the indie/pop rock band The Films and the lead singer and producer of the indie pop duo Alohaha.
Gordon Anthony Chambers (c. 1969) is an American singer-songwriter and record producer who has written songs for more than 75 recording artists including Angie Stone, Yolanda Adams, The Isley Brothers, Brandy, Trey Songz, Chaka Khan, Patti Labelle, Usher, Marc Anthony, Jamie Foxx, Aretha Franklin, Whitney Houston and Beyoncé Knowles.
 His number-1 hits as lyricist include Anita Baker's Grammy-winning hit "I Apologize", Brownstone's Grammy-nominated hit "If You Love Me", Angie Stone's "No More Rain (In This Cloud)", the Grammy-nominated theme of 1996's "Set It Off" "Missing You" (performed by Brandy, Tamia, Gladys Knight and Chaka Khan) and Yolanda Adams "Someone Watching Over Me".
 He is the winner of eight awards from the American Society of Composers, Authors and Publishers (ASCAP), has four Dove Award nominations, and his songs have been nominated for three Grammy Awards. Anita Baker won a Grammy for "I Apologize", which Chambers wrote.
 His songs have been performed at the Essence Awards, American Music Awards, the Goodwill Games and the White House.
 His prestigious appearances, in addition to acclaimed European and Japanese tours,have included the Essence Music Festival, the Congressional Black Caucus, the Apollo Theater, Constitution Hall, B. B King's and the Kennedy Center.
Prince Rogers Nelson (June 7, 1958 – April 21, 2016) was an American singer-songwriter, multi-instrumentalist, and record producer.
 He was a musical innovator who was known for his eclectic work, flamboyant stage presence, extravagant dress and makeup, and wide vocal range.
 His music integrates a wide variety of styles, including funk, rock, R&B, new wave, soul, psychedelia, and pop.
 He has sold over 100 million records worldwide, making him one of the best-selling music artists of all time.
 He won seven Grammy Awards, an American Music Award, a Golden Globe Award, and an Academy Award for the film "Purple Rain".
 He was inducted into the Rock and Roll Hall of Fame in 2004, his first year of eligibility.
Andrew Luis "Dru" Castro is a Grammy Award-winning recording engineer, producer and songwriter in Atlanta, Georgia.
 He has produced or engineered songs for artists such as Ciara, Keyshia Cole, Usher, R. Kelly, T-Pain, Trina, Jamie Foxx and India.Arie.
 Recently, Castro produced and wrote songs with the Grammy award winning singer/songwriter India.Arie on her recently released album "".
 Her 2006 album, "", for which Castro recorded and/or produced seven songs, debuted and peaked at number one on the "Billboard" 200 and the Top R&B/Hip-Hop Albums and was nominated for three Grammy Awards, including "Best R&B Album".
 To date Castro has worked on 12 Grammy nominated projects (4 have won the award) See Below.
 In 2010 Castro won a Grammy with India.Arie as a Producer/Engineer for Best Urban Alternative Performance on the song "Pearls".