Phish is an American rock band formed in Burlington, Vermont, in 1983. The band consists of guitarist Trey Anastasio, bassist Mike Gordon, drummer Jon Fishman, and keyboardist Page McConnell. All four members perform vocals, with Anastasio being the primary lead vocalist. The band is known for their musical improvisation and jams during their concert performances and for their devoted fan followin In the… The driving force behind Phish is the popularity of their concerts and the fan culture surrounding the event. Each a production unto itself, the band is known to consistently change set lists and details, as well as the addition of their own antics to ensure that no two shows are ever the same. With fans flocking to venues hours before they open, the concert is the centerpiece of an event that includes a temporary community in the parking lot similar to the "Shakedown Street" bazaar held outside Grateful Dead concerts. Similar to the Grateful Dead, Phish concerts typically feature two sets, with an intermission in between. During concerts, songs often segue into one another, or produce improvisational jams that can last 10 minutes or more depending on the song. Several regularly performed songs in Phish's repertoire have never appeared on one of their studio albums; these include "Possum", "Mike's Song", "I Am Hydrogen", "Weekapaug Groove", "Harry Hood", "Runaway Jim", "Suzy Greenberg", "AC/DC Bag" and "The Lizards", all of which date to 1990 or earlier and have been played by Phish over 300 times in concert. Chris Kuroda, who has been Phish's lighting director since 1989, creates elaborate light displays during the band's concerts that are sometimes improvised in a similar fashion to their music. Justin Taylor of The Baffler wrote, "You could hate this music with every fiber of your being and still be ready to give Chris Kuroda a MacArthur "genius" grant for what he achieves with his light rig." Kuroda is often referred to by fans as the unofficial fifth member of the band, and has been given the nickname "CK5". Since Phish fans began to discuss the band's live performances on the internet in the late 1990s, they have developed a widely used framework for analyzing the varied forms of improvisation that would regularly occur during a given show. A January 1997 post by Phish fan John Flynn on the rec.music.phish Usenet group first defined the two "types" of jamming that Phish performs in concert. Flynn wrote: "I think Phish jamming falls into two types of jamming: 1) Jamming that is based around a fixed chord progression 2) Jamming that improvises chord…