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

full_context: Document 1: William Dehning: Dr. William John Dehning (August 13, 1942 - June 23, 2017) was an American conductor, teacher, and author who spent almost his entire career in the collegiate realm. He was known primarily for his work as conductor of the University of Southern California Thornton Chamber Choir and as author of the book, "Chorus Confidential: Decoding the Secrets of the Choral Art", published in 2003. Under his leadership, the Thornton Chamber Choir won seven prizes in international European competitions, including Grand Prizes in Varna, Bulgaria and Tours, France. After winning the choral competition with the USC Chamber Choir in Bulgaria, Dehning was awarded the Judges' Conducting Prize by a panel of ten judges in 1999. During his tenure, the ensemble also appeared at American Choral Directors Association (ACDA) conventions six times, including nationals in 2001 and 2005. They also completed a tour of East Asia in 2006, performing at the National Concert Hall in Taipei. While at Northern Michigan University from 1970–1972, Dehning was the founder of the Marquette Choral Society, which is still active. Later, he was from 1985-1995 the founder/conductor of the California Choral Company, a semi-professional chamber chorus that attained a reputation in Europe as well as in the United States. As Chairman of the USC Department of Choral Music (now retired), Dehning was awarded the first annual Dean’s Faculty Award for Excellence in Teaching, and he was also the 2007 recipient of the Thornton School's Ramo Award. Dehning was one of four founding members of the National Collegiate Choral Organization (NCCO), which held its first national conference in San Antonio in 2006.
Document 2: Kathleen Battle: Kathleen Deanna Battle (born August 13, 1948) is an American operatic soprano known for her distinctive vocal range and tone. Born in Portsmouth, Ohio, Battle initially became known for her work within the concert repertoire through performances with major orchestras during the early and mid-1970s. She made her opera debut in 1975. Battle expanded her repertoire into lyric soprano and coloratura soprano roles during the 1980s and early 1990s until her eventual dismissal from the Metropolitan Opera in 1994. After a 22-year absence from the Met, Battle performed a concert of spirituals at the Metropolitan Opera House in November 2016.
Document 3: June Anderson: June Anderson (born December 30, 1952) is a Grammy Award-winning American dramatic coloratura soprano. Originally known for "bel canto" performances of Rossini, Donizetti, and Vincenzo Bellini, she was the first non-Italian ever to win the prestigious Bellini d'Oro prize. Subsequently, she has extended her repertoire to include a wide variety of other roles, including those from the Russian repertoire and works by Richard Strauss. In 2008, Anderson was elevated to "Commandeur" of the Ordre des Arts et des Lettres by the French Government and in 2007 received a "Victoire d'honneur" at the "Victoires de la Musique Classique" in Paris.
Document 4: Larry Humes: Larry Humes is a Distinguished Professor of Hearing Sciences at Indiana University Bloomington. Dr. Humes completed his undergraduate work in 1975 at Purdue University, which was followed by a master's degree from Central Michigan University in 1976, and, finally, a doctorate from Northwestern University in 1979. After an eight-year tenure as a faculty member at Vanderbilt University, he came to Indiana University in 1996. Dr. Humes has been a prolific researcher in the fields of audiology and hearing sciences, publishing over 160 papers and giving over 230 presentations on his research worldwide. Much of his research in recent years has focused on evaluating treatment for speech-perception deficits, age-related changes to auditory perception and outcome measures for hearing aids. For his research, he has been honored numerous times by different organizations. He serves as a Fellow of the American Speech-Language-Hearing Association and the Acoustical Society of America. Additionally, he has received the Alfred E. Kawana Award for Lifetime Achievement from the ASHA and the James Jerger Career Award and Presidential Award from the American Academy of Audiology. Throughput his career, Dr. Humes has served on a variety of editorial board for peer reviewed journals. These include the "Journal of the American Academy of Audiology", "Australian Journal of Audiology", "Journal of Speech", "Language and Hearing Research", and "American Journal of Audiology".
Document 5: Joyce DiDonato: Joyce DiDonato ("née" Flaherty; born February 13, 1969) is an American operatic lyric-coloratura mezzo-soprano notable for her interpretations of the works of Handel, Mozart, and Rossini. She has performed with many of the world's leading opera companies and orchestras, and in 2012 and 2016 won the Grammy Award for Best Classical Vocal Solo.
Document 6: Sylvia McNair: Sylvia McNair (born June 23, 1956) is an American opera singer and classical recitalist who has also achieved notable success in the Broadway and cabaret genres. McNair, a soprano, has made several critically acclaimed recordings and has won two Grammy Awards.
Document 7: Steven M. Zeitels: Steven Marc Zeitels (born November 7, 1957) is the Eugene B. Casey Professor of Laryngeal Surgery at Harvard Medical School and the Director of Massachusetts General Hospital (MGH) Center for Laryngeal Surgery and Voice Rehabilitation (MGH Voice Center). He specializes in diseases and disorders of the throat, voice, airway and larynx. His contributions to voice and laryngeal surgery are highly recognized in the USA and throughout the world. In 2004, the first endowed Chair in Laryngeal Surgery at Harvard Medical School was created for him while he re-established a Harvard Laryngeal Surgery service at the MGH, which had not been present since the 1920s. He has received more than 75 awards and honored lectureships for his achievements including the Casselberry Award, DeRoaldes Medal and the Newcomb Award from the American Laryngological Association (founded in 1879). Zeitels was the 4th surgeon in the organization's history to win all three awards. He has also received the Chevalier Jackson Award and the annual Broyles Maloney Award (3 times) from the American Broncho-Esophageal Association (founded in 1917), as well as the Distinguished Alumnus Award from the Boston University (BU) School of Medicine in 2007. Zeitels is also well known for performing complex microsurgery to restore the voices of performing vocalists and has done so on 15 Grammy award winning artists.
Document 8: Marilyn Mims: Marilyn Mims is an American operatic soprano who had an active career during the 1980s and 1990s. A regular performer at the Metropolitan Opera from 1988 to 1992, her singing career was cut short after being diagnosed with endometriosis in 1995. She notably sang the role of Ortlinde on the Met's 1990 recording of "Die Walküre" which won the Grammy Award for Best Opera Recording. She currently teaches on the voice faculty at Palm Beach Atlantic University.
Document 9: Billie Holiday: Eleanora Fagan (April 7, 1915 – July 17, 1959), professionally known as Billie Holiday, was an American jazz musician and singer-songwriter with a career spanning nearly thirty years. Nicknamed "Lady Day" by her friend and music partner Lester Young, Holiday had a seminal influence on jazz music and pop singing. Her vocal style, strongly inspired by jazz instrumentalists, pioneered a new way of manipulating phrasing and tempo. She was known for her vocal delivery and improvisational skills, which made up for her limited range and lack of formal music education. There were other jazz singers with comparable talent, but Holiday had a voice that captured the attention of her audience.
Document 10: Janwillem van den Berg: Janwillem van den Berg (26 November 1920 in Akkrum – 18 October 1985 in Groningen) was a Dutch speech scientist and medical physicist who played a major role in establishing the myoelastic-aerodynamic theory of voice production. The most notable aspect of van den Berg's theory is its impact on modern speech science in providing a foundation for modern models of vocal fold function.
Document 11: Beverley Peck Johnson: Beverley Peck Johnson (sometimes referred to as Beverley Johnson; June 12, 1904 – January 20, 2001) was an American voice teacher, soprano, and pianist who taught on the faculties of several institutions, including the Juilliard School. Her pupils included several prominent opera singers, actors, and entertainers, including sopranos Renée Fleming, Renata Tebaldi, Anna Moffo, tenor Anthony Dean Griffey, and actors Madeline Kahn, Kevin Kline, and Constance Towers among others. Music critic Anthony Tommasini wrote that "Johnson was particularly valued by students for a keen ability to find individual solutions to their problems."
Document 12: Grace Bumbry: Grace Melzia Bumbry (born January 4, 1937), an American opera singer, is considered one of the leading mezzo-sopranos of her generation, as well as a major soprano for many years. She was a member of a pioneering generation of singers who followed Marian Anderson (including Leontyne Price, Martina Arroyo, Shirley Verrett and Reri Grist) in the world of classical music and paved the way for future African-American opera and classical singers. Bumbry's voice was rich and sizable, possessing a wide range, and was capable of producing a very distinctive plangent tone.
Document 13: 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.
Document 14: 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.
Document 15: Carmen Melis: Carmen Melis (15 August 1885 – 19 December 1967) was an Italian operatic soprano who had a major international career during the first four decades of the 20th century. She was known, above all, as a verismo soprano, and was one of the most interesting singing actresses of the early 20th century. She made her debut in Novara in 1905 and her career rapidly developed in her native country over the next four years. From 1909-1916 she performed with important opera companies in the United States; after which she was busy performing at many of Europe's most important opera houses. From 1917 until her retirement from the stage in 1935 she was particularly active at the Teatro Costanzi in Rome and at La Scala in Milan. After her singing career ended, she embarked on a second career as a voice teacher. Her most notable student was soprano Renata Tebaldi.
ground_truth: four