Question: John Belushi met Dan Aykroyd while working at what Comedy club best known as the first ever on-going improvisational theater troupe based in Chicago.

full_context: Document 1: The Second City: The Second City is an improvisational comedy enterprise, best known as the first ever on-going improvisational theater troupe based in Chicago. It also has programs that run out of Toronto and Los Angeles. The Second City Theatre opened on December 16, 1959, and has since become one of the most influential and prolific comedy theatres in the world.
Document 2: The Un-Scripted Theater Company: Un-Scripted Theater Company is an improv theater company based out of San Francisco, California. Unlike most improv troupes, Un-Scripted Theater Company does not perform just one kind of improv format, but rather 4 to 7 runs of uniquely different improv formats each year. Each season is set up like a "normal" theater season with 4 to 8 week runs of shows, each with its own Director, format, and vision.
Document 3: The Blues Brothers: The Blues Brothers are an American blues and soul revivalist band which was founded in 1978 by comedy actors Dan Aykroyd and John Belushi as part of a musical sketch on "Saturday Night Live." Belushi and Aykroyd, respectively in character as lead vocalist "Joliet" Jake Blues and harmonica player/vocalist Elwood Blues, fronted the band, which was composed of well-known and respected musicians. The band made its debut as the musical guest on the April 22, 1978, episode of "Saturday Night Live," performing "Hey Bartender."
Document 4: Upright Citizens Brigade Theatre: The Upright Citizens Brigade Theatre (shorter UCB Theatre) is an American improvisational theatre and training center, founded by the Upright Citizens Brigade troupe members, including Matt Besser, Amy Poehler, Ian Roberts and Matt Walsh. It has locations in the New York neighborhoods of Chelsea and the East Village as well as the Los Angeles neighborhoods of Hollywood and Sunset Boulevard.
Document 5: Belushi: A Biography: Belushi: A Biography is an "oral history" biography of John Belushi, written and collaborated by John's widow, Judith Belushi Pisano and co-author Tanner Colby, with an introduction by Dan Aykroyd. Filled with anecdotes and interviews from John's personal friends, fellow "Saturday Night Live" alumni, and film co-stars, it is a non-objective, positive portrayal of the actor's life and influence.
Document 6: The Committee (improv group): The Committee was a San Francisco-based improvisational comedy group founded by Alan Myerson and Jessica Myerson, formerly known as Irene Ryan, Irene Riordan and now known as Latifah Taormina. The Myersons were both alums of The Second City in Chicago. The Committee opened April 10, 1963 at 622 Broadway in a 300-seat Cabaret theater that used to be an indoor bocce ball court in San Francisco's North Beach. Garry Goodrow, Hamilton Camp, Larry Hankin, Kathryn Ish, Scott Beach and Ellsworth Milburn were the cast. Jerry Mander handled the group's PR, and Richard Stahl, who later joined the improv troupe, was its first company manager. Jessica Myerson joined the company in May. Arthur Cantor took the company to Broadway in New York in 1964 for a limited engagement at the Henry Miller Theater. This occasioned a second group to hold the fort in San Francisco. Morgan Upton, Peter Lane, Leigh French, Chris Ross, Howard Hesseman (who used the name Don Sturdy), Nancy Fish, Peter Bonerz and Carl Gottlieb became the mainstays of the San Francisco troupe. Roger Bowen, a founding member of both The Compass Players and The Second City, joined in 1966. John Brent, co-creator with Del Close of the "How to Speak Hip" album and a bit player in many movies ("Catch-22", "American Graffiti", "More American Graffiti", "Bob & Carol & Ted & Alice", "Steelyard Blues", "Porklips Now"), was also a member.
Document 7: Eddie Murphy: Edward Regan Murphy (born April 3, 1961) is an American comedian, actor, writer, singer, and producer. Murphy was a regular cast member on "Saturday Night Live" from 1980 to 1984. He has worked as a stand-up comedian and was ranked #10 on Comedy Central's list of the 100 Greatest Stand-ups of All Time.
Document 8: Harold (improvisation): Harold is a structure used in longform improvisational theatre. Developed by Del Close and brought to fruit through Close's collaboration with Charna Halpern, the Harold has become the signature form of Chicago's iO Theater and the Upright Citizens Brigade Theatre in New York City and Los Angeles. It is now performed by improv troupes and teams across the world.
Document 9: Monteith and Rand: Monteith and Rand are a comedy team who had their own Broadway show at the Booth Theater in 1979, produced by James Lipton, after a successful off-Broadway run. Suzanne Rand and John Monteith are graduates of Second City; Suzanne was in the famed company that included John Belushi and Bill Murray in Chicago, and John performed with John Candy, Dan Aykroyd and Gilda Radner in Toronto. Monteith and Rand live in New York City where they teach and perform.
Document 10: The Blues Brothers (film): The Blues Brothers is a 1980 American musical crime comedy film directed by John Landis. It stars John Belushi and Dan Aykroyd as "Joliet" Jake and Elwood Blues, characters developed from "The Blues Brothers" musical sketch on the NBC variety series "Saturday Night Live". The film's screenplay was written by Aykroyd and Landis. It features musical numbers by rhythm and blues (R&B), soul, and blues singers James Brown, Cab Calloway, Aretha Franklin, Ray Charles, and John Lee Hooker. The film is set in and around Chicago, Illinois, where it was filmed. It features non-musical supporting performances by John Candy, Carrie Fisher, Charles Napier, and Henry Gibson.
Document 11: John Belushi: John Adam Belushi ( ; January 24, 1949 – March 5, 1982) was an American comedian, actor and musician. Belushi is best known for his "intense energy and raucous attitude" which he displayed as one of the seven original cast members of the NBC sketch comedy show "Saturday Night Live" ("SNL"). Throughout his career, Belushi had a close personal and artistic partnership with his fellow "SNL" star Dan Aykroyd, whom he met while they were both working at Chicago's The Second City comedy club.
Document 12: Jim Belushi: James Adam Belushi ( ; born June 15, 1954) is an American comic actor, voice actor, comedian, singer and musician.
Document 13: IO Theater: iO, or iO Chicago, (formerly known as "ImprovOlympic") is an improv theater and training center in central Chicago, with a branch in Los Angeles called iO West. The theater both teaches and hosts performances of improvisational comedy. It was founded in 1981 by the late Del Close and Charna Halpern. The theater has many notable alumni, including Amy Poehler and Stephen Colbert.
Document 14: Chris Farley: Christopher Crosby Farley (February 15, 1964 – December 18, 1997) was an American actor and comedian. Farley was known for his loud, energetic comedic style, and was a member of Chicago's Second City Theatre and later a cast member of the NBC sketch comedy show "Saturday Night Live" between 1990 and 1995. Farley died of a drug overdose in 1997 at the age of 33.
Document 15: Dan Aykroyd: Daniel Edward Aykroyd {'1': ", '2': ", '3': ", '4': "} (born July 1, 1952) is a Canadian-American actor, comedian, producer, screenwriter, musician and businessman. He was an original member of the "Not Ready for Prime Time Players" on "Saturday Night Live" (1975–1979). A musical sketch he performed with John Belushi on "SNL", The Blues Brothers, turned into an actual performing band and then a highly successful 1980 film, also called "The Blues Brothers".
ground_truth: The Second City