Background: Alfred Cellier (1 December 1844 - 28 December 1891) was an English composer, orchestrator and conductor. In addition to conducting and music directing the original productions of several of the most famous Gilbert and Sullivan works and writing the overtures to some of them, Cellier conducted at many theatres in London, New York and on tour in Britain, America and Australia. He composed over a dozen operas and other works for the theatre, as well as for orchestra, but his 1886 comic opera, Dorothy, was by far his most successful work. It became the longest-running piece of musical theatre in the nineteenth century.
Context: In 1885, Cellier composed a song, "There once was a time, my darling", for a piece produced by George Edwardes, Little Jack Sheppard (1885). Meanwhile he had composed what would become his greatest success, the comic opera Dorothy, with a libretto by B. C. Stephenson. To create the score, Cellier repurposed some of his music from his 1876 failure, Nell Gwynne, which had, nevertheless, received praise for its music. Dorothy had been announced for production at the Royalty Theatre in 1884, but ultimately Edwardes mounted it at his Gaiety Theatre on 25 September 1886. Cellier was in Australia from February 1886 to February 1887, conducting The Mikado and other Gilbert and Sullivan operas for the J. C. Williamson organization and was absent from London during the productions of The Carp, at the Savoy, and Dorothy. Neither the music nor the libretto of Dorothy initially attracted critical praise. The Times wrote, "Gentility reigns supreme, and with it unfortunately also a good deal of the refined feebleness and the ineptitude which are the defects of that quality." Stephenson rewrote the lyrics of one of Cellier's old songs, "Old Dreams" as "Queen of My Heart"; this helped the work to find success after it transferred in December to the Prince of Wales Theatre. The following year H. J. Leslie took over the production from Edwardes and introduced new stars, including Marie Tempest. Dorothy became an even greater success at the box office and transferred in December 1888 to the Lyric Theatre, built using the profits from the production, where it ran into 1889. Its initial run of a total of 931 performances was the longest of any piece of musical theatre up to that time, longer than even The Mikado, a fact that caused consternation to Cellier's friend Arthur Sullivan. Some critics reconsidered their earlier condemnation, the work became regarded as a classic Victorian piece, and the initially despised plot was traced seriously back to the Restoration playwrights David Garrick and Aphra Behn, and to Oliver Goldsmith and even Shakespeare. Its success led to revivals of some of Cellier's earlier works. Cellier returned to Australia in 1888 to conduct Dorothy and made a final brief visit there for health reasons in early 1891, together with Stephenson. His last comic operas, Doris (1889, with Stephenson) and The Mountebanks (with Gilbert, produced in January 1892, a few days after the composer's death), were both modestly successful. Also after Cellier's death, Rutland Barrington used some of his music in his 1902 adaptation of Water Babies. Often in ill health throughout his life, Cellier was unable to finish The Mountebanks, and Ivan Caryll completed the score. Cellier owed much to the influence of Sullivan. He was a fertile melodist, and his writing exhibited elegance and refinement, although he was not able to infuse his music with humour in the way that Sullivan did. Cellier died at his home in Bloomsbury, London, at the age of 47. He was buried in West Norwood Cemetery.
Question: Was it successful?
Answer: Neither the music nor the libretto of Dorothy initially attracted critical praise.

Question:
The Vienna Boys' Choir (German: Wiener Sangerknaben) or Vienna Choir Boys is a choir of boy sopranos and altos based in Vienna, Austria. It is one of the best known boys' choirs in the world. The boys are selected mainly from Austria, but also from many other countries. The choir is a private, not-for-profit organization.
Gerald Wirth became the choir's artistic director in 2001. However, since then, the choir has come under pressure to modernize and has faced criticism of their musical standards, leading to a split with the Vienna State Opera. The choir has for the first time had to advertise for recruits after a rival choir school was established by Ioan Holender, director of the opera company. He complained of both falling standards and poor communication with the choir. He said that the State Opera sometimes trained boys for particular stage roles, only to find out on the day of performance that they were unavailable as they had gone on tour with the choir. Some boys were attracted to the rival choir school by the prospect of a more relaxed atmosphere and of performance fees being paid directly to them. The Vienna Boys' Choir has sought to update its image, recording pop music selections and adopting an alternative uniform to the sailor suits used since the 1920s, allowing the boys to dance as they sing. After Eugen Jesser died in May 2008, Walter Nettig became the choir's president. Gerald Wirth has been the artistic director since 2001, and he also became the choir's president in 2013. In 2010, following sexual abuse allegations from two former choristers stemming from the late 1960s and early 1980s, the Vienna Boys' Choir opened a confidential phone and e-mail hotline to allow others to come forward. Eight possible victims came forward saying they were abused, either by staff or other choir members.
Answer this question using a quote from the text above:

Where does the Vienna Boys Choir perform?

Answer:

Problem: Background: Robert Swan Mueller III (; born August 7, 1944) is an American attorney who served as the sixth Director of the Federal Bureau of Investigation from 2001 to 2013. A Republican, he was appointed by President George W. Bush; President Barack Obama gave his original ten-year term a two-year extension, making him the longest-serving FBI director since J. Edgar Hoover. He is currently head of the Special Counsel investigation of Russian interference in the 2016 United States elections and related matters. A graduate of Princeton University, Mueller served as a Marine Corps officer during the Vietnam War, receiving the Bronze Star Medal with Combat "V" for heroism and the Purple Heart Medal.
Context: Mueller was accepted for officer training in the United States Marine Corps in 1968, attending training at Parris Island, Officer Candidate School, Army Ranger School, and Army jump school. In July 1968, he was sent to South Vietnam, where he served as a rifle platoon leader with Second Platoon, H Company, 2nd Battalion, 4th Marines, 3rd Marine Division. In December 1968, he earned the Bronze Star with 'V' distinction for combat valor for rescuing a wounded Marine under enemy fire during an ambush that saw half of his platoon become casualties. In April 1969, he received an enemy gunshot wound in the thigh, recovered, and returned to lead his platoon until June 1969. For his service in and during the Vietnam War, his military decorations and awards include: the Bronze Star Medal with Combat "V", Purple Heart Medal, two Navy and Marine Corps Commendation Medals with Combat "V", Combat Action Ribbon, National Defense Service Medal, Vietnam Service Medal with three service stars, Republic of Vietnam Gallantry Cross, Republic of Vietnam Campaign Medal, and Parachutist Badge. Mueller eventually became aide-de-camp to 3rd Marine Division's commanding general, then-Major General William K. Jones, where he "significantly contributed to the rapport" Jones had with other officers, according to one report. Reflecting on his service in the Vietnam War, Mueller said, "I consider myself exceptionally lucky to have made it out of Vietnam. There were many--many--who did not. And perhaps because I did survive Vietnam, I have always felt compelled to contribute." After returning from Vietnam, Mueller was briefly stationed at Henderson Hall, before leaving active-duty service in August 1970. He was inducted into the Ranger Hall of Fame in 2004.
Question: What did he do after training?
Answer:
In July 1968, he was sent to South Vietnam, where he served as a rifle platoon leader