Question: How many Grammy Awards did one of William Vennard's students, Marilyn Horne win?

Context paragraphs:
Robert Glasper: 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.

Charles Chalmers: 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."

Marilyn Horne: 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.

Sesame Street Jam: A Musical Celebration: Sesame Street Jam: A Musical Celebration is a "Sesame Street" musical special first broadcast on PBS from 1994.  The home video version does not include five great images.  From the 1993 video "Sesame Street: 25 Wonderful Years" released October 29, 1993.  In it, Big Bird read the title card in voice-over.  Songs sung by celebrities.  They include "Adventure" with En Vogue (EKA: Episode 2951), "C Is For Cookie" with Marilyn Horne(EKA: Episode 3189), "Rubber Duckie" with Little Richard (EKA: Episode 3309) intro and closing shot cut, "The Letter O" with Queen Latifah (EKA: Episode 3066) with sound effects, "I Don't Want To Live On The Moon" with Aaron Neville (EKA: Episode 3242), "My Name" with Maya Angelou (EKA: Episode 3139) intro cut, "New Way To Walk" (EKA: Episode 3233) celebrity version, "Elmo And The Lavender Moon" with Los Lobos" (EKA: Episode 3101) "Monster In The Mirror" (EKA: Episode 2835) (The Simpsons ending cut) (Celebrity version), "Sing" (Ladysmith Black Mambazo).  The end credits are pretty long.

James Westman: James Westman (born September 16, 1972) is a Canadian baritone known for his interpretation of the Verdi, Puccini and bel canto operatic repertoire, and particularly his signature role of Germont in "La traviata", which he has sung in over 150 performances, with opera companies such as San Francisco Opera, Houston Grand Opera, Pittsburgh Opera, Florida Grand Opera, Graz Opera, Santa Fe Opera, Chicago Lyric Opera, Opéra de Montréal, Los Angeles Opera, Grand Théâtre de Bordeaux, Canadian Opera Company, Boston Lyric Opera, Cologne Opera, Vancouver Opera, English National Opera, San Diego Opera, Dallas Opera, Utah Opera, and Opera Theatre of St. Louis.  On January 29, 2011 Westman created the lead role of Sandy Keith In the world premiere of Bramwell Tovey's The Inventor.  In 2017 he played Sir John A. MacDonald in Harry Somers's Louis Riel for the Canadian Opera Company's tribute to Canada's 150th celebrations.  As a recitalist, he has performed for the Marilyn Horne Foundation, Aldeburgh Connection, Aldeburgh Festival, Musikverein, Wigmore Hall, Queen Elizabeth Hall, Morgan Library & Museum, Koerner Hall, Carnegie Hall, Saito Kinen Festival in Japan, Stratford Summer Music, British Broadcasting Corporation, and the Canadian Broadcasting Corporation.  Westman first came to attention at the age of twelve when he was the first boy soprano to perform and record Mahler "4th Symphony" with Benjamin Zander and the Boston Philharmonic Orchestra in 1984.  Westman is regularly featured as the Anthem singer for the Toronto Maple Leafs and numerous other NHL franchises.  Four of Westman's recordings have been nominated for a Juno Award.  Two recordings nominated for a Grammy Award.

Michael Scott (artistic director): 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".

Gordon Goodwin's Big Phat Band: 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.

The Ghosts of Versailles: The Ghosts of Versailles is an opera in two acts, with music by John Corigliano to an English libretto by William M. Hoffman.  The Metropolitan Opera had commissioned the work from Corigliano in 1980 in celebration of its 100th anniversary, with the premiere scheduled for 1983.  Corigliano and Hoffman took as the starting point for the opera the play "La Mère coupable" ("The Guilty Mother") by Pierre Beaumarchais.  They took seven years to complete the opera, past the initial deadline.  The opera received its premiere on December 19, 1991, at the Metropolitan Opera, with the production directed by Colin Graham.  The premiere run of seven performances was sold out.  The original cast included Teresa Stratas, Håkan Hagegård, Renée Fleming, Graham Clark, Gino Quilico, and Marilyn Horne.  The Metropolitan Opera revived the opera in the 1994/1995 season.

William Vennard: William Vennard (31 January 1909 Normal, Illinois – 10 January 1971 Los Angeles, California) was a famous American vocal pedagogist who devoted his life to researching the human voice and its use in singing.  He was one of the driving forces behind a major shift within the field of vocal pedagogy during the middle of the 20th century.  Along with a few other American singing teachers, such as Ralph Appelman at Indiana University, Vennard introduced contemporary scientific research in the areas of human anatomy and physiology into the study of singing.  This shift in approach led to the rejection of many of the beliefs and practices held since the bel canto era, most particularly in the areas of vocal registration and vocal resonation.  Vennard was renowned as an excellent teacher whose written works have influenced generations of singers, vocal pedagogues and voice scientists.  He taught many successful singers including acclaimed mezzo-soprano Marilyn Horne, who studied under him at the University of Southern California.

The King and I (1992 studio cast): The King and I is the 1992 studio cast recording of the musical play conducted by John Mauceri of the Hollywood Bowl Orchestra and starring Julie Andrews, Ben Kingsley, Lea Salonga, Peabo Bryson, and Marilyn Horne.

Supporting paragraphs: William Vennard Marilyn Horne
Answer: four