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 progressions, rhythms, and the whole structure of the music." Since then, Phish fans have used the terms "Type 1" and "Type 2" and Flynn's definitions to contextualize the structure of Phish's shows and songs. Because Phish's reputation is so grounded in their live performances, concert recordings are commonly traded commodities. In December 2002, the band launched the LivePhish website, from which official soundboard recordings can be purchased. Legal field recordings produced by tapers with boom microphones from the audience in compliance with Phish's tape trading policy are frequently traded on any number of music message boards. Although technically not allowed, live videos of Phish shows are also traded by fans and are tolerated as long as they are for non-profit, personal use. Phish fans have been noted for their extensive collections of fan-taped concert recordings; owning recordings of entire tours and years is widespread. Fans' recordings are generally sourced from the officially designated tapers' section at each show, by fans with devoted sound recording rigs. Tickets for the tapers' section are acquired separately from regular audience tickets, and directly from the band's website, instead of the venue or a service like Ticketmaster. However, tapers are also required to purchase a general admission ticket for concerts. The band disallowed tapers from patching directly into Paul Languedoc's soundboard in 1990, after a fan unplugged some of his equipment during a concert that June. In 2014, the band launched their own on-demand streaming service, LivePhish+. The platform features hundreds of soundboard recordings of the band's concerts for streaming, including all of their shows from 2002 onwards, as well as all of their studio albums. Phish continues to allow fans to tape and distribute audience recordings of their concerts after the launch of the LivePhish storefront and streaming services. Books and podcasts Several books on Phish have been published, including two official publications: The Phish Book, a 1998 coffee table book credited to the band members and journalist Richard Gehr which focused on the band's activities during 1996 and 1997, and Phish: The Biography, a semi-official biographical book written by music journalist and Phish fan Parke