Problem: Background: Grace Brewster Murray Hopper (nee Murray; December 9, 1906 - January 1, 1992) was an American computer scientist and United States Navy rear admiral. One of the first programmers of the Harvard Mark I computer, she was a pioneer of computer programming who invented one of the first compiler related tools. She popularized the idea of machine-independent programming languages, which led to the development of COBOL, an early high-level programming language still in use today. Hopper had attempted to enlist in the Navy during World War II, but she was rejected by the military because she was 34 years of age and thus too old to enlist.
Context: In accordance with Navy attrition regulations, Hopper retired from the Naval Reserve with the rank of commander at age 60 at the end of 1966. She was recalled to active duty in August 1967 for a six-month period that turned into an indefinite assignment. She again retired in 1971 but was again asked to return to active duty in 1972. She was promoted to captain in 1973 by Admiral Elmo R. Zumwalt, Jr. After Republican Representative Philip Crane saw her on a March 1983 segment of 60 Minutes, he championed H.J.Res. 341, a joint resolution originating in the House of Representatives, which led to her promotion to commodore by special Presidential appointment. She remained on active duty for several years beyond mandatory retirement by special approval of Congress. Effective November 8, 1985, the rank of commodore was renamed rear admiral (lower half) and Hopper became one of the Navy's few female admirals. Following a career that spanned more than 42 years, Admiral Hopper took mandatory retirement from the Navy on August 14, 1986. At a celebration held in Boston on the USS Constitution to commemorate her retirement, Hopper was awarded the Defense Distinguished Service Medal, the highest non-combat decoration awarded by the Department of Defense. At the time of her retirement, she was the oldest active-duty commissioned officer in the United States Navy (79 years, eight months and five days), and had her retirement ceremony aboard the oldest commissioned ship in the United States Navy (188 years, nine months and 23 days). (Admirals William D. Leahy, Chester W. Nimitz, Hyman G. Rickover and Charles Stewart were the only other officers in the Navy's history to serve on active duty at a higher age. Leahy and Nimitz served on active duty for life due to their promotions to the rank of fleet admiral.)
Question: When did she retire?
Answer: at the end of 1966.

Problem: Background: Judas Priest are an English heavy metal band formed in West Bromwich in 1969. The band have sold over 50 million copies of their albums to date. They are frequently ranked as one of the greatest metal bands of all time. Despite an innovative and pioneering body of work in the latter half of the 1970s, the band struggled with indifferent record production, repeated changes of drummer, and lack of major commercial success or attention until 1980, when they adopted a more simplified sound on the album British Steel, which helped shoot them to rock superstar status.
Context: Judas Priest went into the studio in June-July 1974 with Black Sabbath producer Rodger Bain. The band released their debut single "Rocka Rolla" that August and followed in September with an album of the same name. The album features a variety of styles--straight-up rock, heavy riffing, and progressive. Technical problems during the recording contributed to the poor sound quality of the record. Producer Rodger Bain, whose resume included Black Sabbath's first three albums as well as Budgie's first album, dominated the production of the album and made decisions with which the band did not agree. Bain also chose to leave fan favourites from the band's live set, such as "Tyrant", "Genocide" and "The Ripper", off the album and he cut the song "Caviar and Meths" from a 10-minute song down to a 2-minute instrumental. The tour for Rocka Rolla was Judas Priest's first international tour with dates in Germany, the Netherlands, Norway and Denmark including one show at Hotel Klubben in Tonsberg, one hour from Oslo, Norway, which scored them a somewhat negative review in the local press. The album flopped upon release, leaving Priest in dire financial straits. Priest attempted to secure a deal with Gull Records to get a monthly pay of 50 pounds, however, because Gull Records were struggling as well, they declined. Rocka Rolla (1974) has been for the most part dismissed by the band and none of its songs were played live after 1976 except for "Never Satisfied", which was revived during the Epitaph Tour in 2011.
Question: Where did they perform?
Answer: in Germany, the Netherlands, Norway and Denmark

Problem: Background: Chester Burton "Chet" Atkins (June 20, 1924 - June 30, 2001), known as "Mr. Guitar" and "The Country Gentleman", was an American musician, occasional vocalist, songwriter, and record producer, who along with Owen Bradley and Bob Ferguson, among others, created the country music style that came to be known as the Nashville sound, which expanded country music's appeal to adult pop music fans. He was primarily known as a guitarist. He also played the mandolin, fiddle, banjo, and ukulele. Atkins's signature picking style was inspired by Merle Travis.
Context: While working with a Western band in Denver, Colorado, Atkins came to the attention of RCA Victor. Siman had been encouraging Steve Sholes to sign Atkins, as his style (with the success of Merle Travis as a hit recording artist) was suddenly in vogue. Sholes, A&R director of country music at RCA, tracked Atkins down in Denver. He made his first RCA Victor recordings in Chicago in 1947. They did not sell, but he did some studio work for RCA that year but had relocated to Knoxville again, where he worked with Homer and Jethro on WNOX's new Saturday night radio show The Tennessee Barn Dance and the popular Midday Merry Go Round. In 1949, he left WNOX to join June Carter with Mother Maybelle and the Carter Sisters on KWTO. This incarnation of the old Carter Family featured Maybelle Carter and daughters June, Helen, and Anita. Their work soon attracted attention from the Grand Ole Opry. The group relocated to Nashville in the mid-1950s. Atkins began working on recording sessions and performing on WSM-AM and the Opry. Atkins became a member of the Opry in the 1950s. While he had not yet had a hit record for RCA Victor, his stature was growing. He began assisting Sholes as a session leader when the New York-based producer needed help organizing Nashville sessions for RCA Victor artists. Atkins's first hit single was "Mr. Sandman", followed by "Silver Bell", which he recorded as a duet with Hank Snow. His albums also became more popular. He was featured on ABC-TV's The Eddy Arnold Show in the summer of 1956 and on Country Music Jubilee in 1957 and 1958 (by then renamed Jubilee USA). In addition to recording, Atkins was a design consultant for Gretsch, which manufactured a popular Chet Atkins line of electric guitars from 1955-1980. He became manager of RCA Victor's Nashville studio, eventually inspiring and seeing the completion of the legendary RCA Studio B, the first studio built specifically for the purpose of recording on the now-famous Music Row.
Question: Did he record any song with them?
Answer:
He made his first RCA Victor recordings in Chicago