The Simpsons Spin-Off Showcase unoriginal, poor television writing and references and parodies many television series. When Troy McClure mentions that Fox can only fill up three slots for the next season, the three series are "Melrose Place", "The X-Files" and "The Simpsons" itself. In the museum of television, Troy walks by posters of spin-offs, such as "The Ropers" (spun off from "Three's Company"), "Laverne & Shirley" (spun off from "Happy Days"), "Rhoda", a show that Julie Kavner, the voice of Marge, once starred in, (spun off from "The Mary Tyler Moore Show") and "Fish" (spun off from "Barney Miller"), to demonstrate the power of
World Series of Rock with FirstEnergy Stadium built on the same site. County Stadium in Milwaukee, Wisconsin staged its own series of rock festivals, also called the World Series of Rock, in the early 1980s. Since then, "World Series of Rock" has become a generic term for multi-act concerts. June 23, 1974 August 4, 1974 September 1, 1974 May 31, 1975 June 14, 1975 July 11, 1975 August 23, 1975 June 5, 1977 June 25, 1977 August 6, 1977 July 1, 1978 July 15, 1978 August 26, 1978 July 28, 1979 July 19, 1980 Murray Saul and Shelly Stile of WMMS open a World