Question: What book written by Maria von Trapp inspired a famous musical that was performed live on ITV in 2015?

Context articles: Maria von Trapp
Maria Franziska von Trapp
The Trapp Family
Alix Williamson
Trapp Family Austrian Relief
Hedwig von Trapp
The von Trapps
The Sound of Music Live (2015)
Edelweiss (song)
The Sound of Music

Maria Augusta von Trapp (née Kutschera; 26 January 1905 – 28 March 1987), also known as Baroness von Trapp, was the stepmother and matriarch of the Trapp Family Singers.
 She wrote "The Story of the Trapp Family Singers" which was published in 1949.
 The story served as the inspiration for the 1956 West German film "The Trapp Family", which in turn inspired the Broadway musical "The Sound of Music" (1959) and the 1965 film of the same name.
Maria Agatha Franziska Gobertina von Trapp (28 September 1914 – 18 February 2014) was the second-oldest daughter of Georg von Trapp and his first wife, Agatha Whitehead von Trapp.
 She was a member of the Trapp Family Singers, whose lives inspired the musical and film "The Sound of Music".
 She was portrayed as the character "Louisa".
 She died at age 99, and was the last surviving sibling portrayed in the film.
The Trapp Family (German: "Die Trapp-Familie" ) is a 1956 West German comedy drama film directed by Wolfgang Liebeneiner and starring Ruth Leuwerik, Hans Holt, and Maria Holst.
 Based on Maria von Trapp's memoir, "The Story of the Trapp Family Singers", the film is about a novice nun sent to care for the unruly children of a wealthy baron, who falls in love with and marries the young woman.
 Through her caring influence, the family becomes a famous singing group.
 When the baron is pressured to join Hitler's army, the family escapes to the United States where they establish themselves as singers.
Alix Williamson (5 April 1916 – 26 August 2001) was an American publicist who specialized in promoting musical artists both in the United States and abroad.
 A graduate of Hunter College, she promoted the Juilliard String Quartet for 23 years and The Chamber Music Society of Lincoln Center for 22 years.
 For 15 years she was the press representative for pianist André Watts, and also spent 15 years as tenor Richard Tucker's press agent.
 She managed the career of the Trapp Family Singers for more than two decades; and it was she who came up with the idea for Maria von Trapp's autobiographical work "The Story of the Trapp Family Singers" (1949) (the basis for the Rodgers and Hammerstein musical "The Sound of Music").
 She also worked as a promoter for the New York Philharmonic for 15 years.
Trapp Family Austrian Relief, Inc. is an initiative founded by Georg von Trapp and Maria von Trapp.
Hedwig Maria Adolphine Gobertina von Trapp (28 July 1917 – 14 September 1972) was the fifth child of Georg von Trapp and his first wife, Agatha Whitehead von Trapp.
 She was a member of the Trapp Family Singers, whose lives were the inspiration for the play and movie "The Sound of Music".
 She was portrayed as the character "Brigitta".
The von Trapps (formerly The von Trapp Children) is a musical group made up of Sofia, Melanie, Amanda and August (formerly Justin) von Trapp, descendants of the Trapp Family Singers.
 They are the grandchildren of Werner von Trapp, who was portrayed as Kurt in "The Sound of Music", and the great-grandchildren of Georg Ritter von Trapp and his first wife Agathe Whitehead, and the step-great-grandchildren of Maria von Trapp, Georg's second wife.
The Sound of Music Live is a television special that was originally broadcast by ITV on 20 December 2015.
 The special was an adaptation of Rodgers and Hammerstein's Broadway musical "The Sound of Music", starring Kara Tointon as Maria von Trapp, performed and televised live from 3 Mills Studios in London.
 Notable cast members include: Kara Tointon, Katherine Kelly, Alexander Armstrong, Julian Ovenden, Mel Giedroyc, Maria Friedman and notable child actors including Guy Trundle, Tom Sargent and Zac Lester, among others.
"Edelweiss" is a show tune from the 1959 Rodgers and Hammerstein musical "The Sound of Music".
 It is named after the edelweiss, a white flower found high in the Alps "(Leontopodium alpinum)".
 It was created for the 1959 Broadway production of "The Sound of Music" in the role originated by performer Theodore Bikel as a song for the character of Captain Georg Ludwig von Trapp.
 In the musical, Captain von Trapp and his family sing this song during the concert near the end of Act II as a statement of Austrian patriotism in the face of the pressure put upon him to join the navy of Nazi Germany following the Anschluss.
 It is also Captain von Trapp's subliminal goodbye to his beloved homeland, using the flower as a symbol of his loyalty to Austria.
 In the 1965 film adaptation, the song is also sung by the Captain earlier in the film when he rediscovers music with his children.
The Sound of Music is a musical with music by Richard Rodgers, lyrics by Oscar Hammerstein II and a book by Howard Lindsay and Russel Crouse.
 It is based on the memoir of Maria von Trapp, "The Story of the Trapp Family Singers".
 Set in Austria on the eve of the Anschluss in 1938, the musical tells the story of Maria, who takes a job as governess to a large family while she decides whether to become a nun.
 She falls in love with the children, and eventually their widowed father, Captain von Trapp.
 He is ordered to accept a commission in the German navy, but he opposes the Nazis.
 He and Maria decide on a plan to flee Austria with the children.
 Many songs from the musical have become standards, such as "Edelweiss", "My Favorite Things", "Climb Ev'ry Mountain", "Do-Re-Mi", and the title song "The Sound of Music".