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https://en.wikipedia.org/wiki/The_Second_City
The Second City is an improvisational comedy enterprise and historically first on-going improvisational theater troupe, continually based in Chicago. It also has training programs and live theatres in 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.
The Second City has produced television programs in both Canada and the United States, including SCTV, (SNL), Second City Presents, and Next Comedy Legend. Since its debut, The Second City has consistently been a notable starting point for comedians, award-winning actors, directors, and others in show business, including Bill Murray, Gilda Radner, John Candy, John Belushi, Dan Aykroyd, Del Close, Eugene Levy, Catherine O'Hara, Nia Vardalos, Ryan Stiles, Mike Myers, Steve Carell, Tina Fey, Amy Poehler, Stephen Colbert, and many others.