Short answers, pulled from the story.
Stanley Sadie was a British musicologist, music critic, and editor who lived from the 30th of October 1930 to the 21st of March 2005. He is best known for editing The New Grove Dictionary of Music and Musicians, published in 1980, which expanded the earlier Grove Dictionary from nine volumes to twenty volumes.
The New Grove Dictionary of Music and Musicians is a major music reference work that Sadie transformed from a planned sixth edition of the original Grove Dictionary into a twenty-volume publication in 1980. A second edition followed in 2001, expanding further to twenty-nine volumes. Sadie served as editor from 1970 onward.
Sadie studied at Gonville and Caius College, Cambridge, under musicologist Thurston Dart. He earned a Bachelor of Arts and a Bachelor of Music in 1953, a Master of Arts in 1957, and a PhD in 1958. His doctoral dissertation examined mid-eighteenth-century British chamber music.
Sadie edited the New Grove Dictionary of Musical Instruments in three volumes in 1984, the New Grove Dictionary of American Music in four volumes in 1986 with H. Wiley Hitchcock, the New Grove Dictionary of Opera in four volumes in 1992, and the one-volume Grove Concise Dictionary of Music in 1988.
Mozart: The Early Years was published in 2006, the year after Sadie's death. It was intended as the first volume of a large biography of Wolfgang Amadeus Mozart. Sadie's colleague Neal Zaslaw contributed a foreword and helped bring the book to publication.
Sadie was appointed CBE in 1982 and received an honorary Doctor of Letters from the University of Leicester the same year. He was elected honorary fellow of the Royal College of Music in 1994, served as president of the International Musicological Society from 1992 to 1997, and became a Handel Prize laureate in 2005.