Context: In July 1943, as a result of the American Federation of Musicians boycott of US recording studios, the a cappella vocal group The Song Spinners had a best-seller with "Comin' In On A Wing And A Prayer". In the 1950s several recording groups, notably The Hi-Los and the Four Freshmen, introduced complex jazz harmonies to a cappella performances. The King's Singers are credited with promoting interest in small-group a cappella performances in the 1960s. In 1983 an a cappella group known as The Flying Pickets had a Christmas 'number one' in the UK with a cover of Yazoo's (known in the US as Yaz) "Only You". A cappella music attained renewed prominence from the late 1980s onward, spurred by the success of Top 40 recordings by artists such as The Manhattan Transfer, Bobby McFerrin, Huey Lewis and the News, All-4-One, The Nylons, Backstreet Boys and Boyz II Men.[citation needed]

Question: What a cappella group rose to popularity in 1943?
Answer: The Song Spinners

Question: What was boycotted by American musicians in 1943?
Answer: US recording studios

Question: Who is credited for first introducing elements of Jazz into a cappella?
Answer: The Hi-Los and the Four Freshmen

Question: What number one song was covered by an a cappella group in 1983?
Answer: "Only You"

Question: During and after the 80's, what helped a cappella music rise in popularity?
Answer: the success of Top 40 recordings

Question: Who boycotted concerts in 1943?
Answer: Unanswerable

Question: Who introduced jazz harmonies to a capella in the 40's?
Answer: Unanswerable

Question: What number one hit did Yazoo have in 1983?
Answer: Unanswerable

Question: What gained renewed intrest the 1950's?
Answer: Unanswerable

Question: What did The Song Spinners have in the 1950's?
Answer: Unanswerable

Question: What was the name of The Song Spinners best seller in the 1950's?
Answer: Unanswerable

Question: When did the American Federation of Musicians introduce jazz to a cappella?
Answer: Unanswerable

Question: In 1983 what did The King's Singers promote?
Answer: Unanswerable

Question: What did A cappella gain in July 1943?
Answer: Unanswerable