P-Model (also spelled as "P-MODEL" and "P. Model") was a Japanese experimental/electronic rock band started in 1979 by frontman Susumu Hirasawa. The band has experienced many lineup revisions over the years but Hirasawa was always at the helm of operations. It went through various periods of inactivity, notably from 28 December 1988 to 23 November 1990 and from 11 October 1993 to 1 December 1994. P-MODEL officially disbanded on 20 December 2000, although many of its members continue to release solo albums and collaborate with each other on different projects.
Hirasawa has also released solo work under the similar name "KAKU P-MODEL", primarily the 2004 album Vistoron and the 2013 album гипноза (Gipnoza), with the latter having guest appearances by a former P-MODEL member and a P-MODEL associate.
P-Model is the eighth studio album by P-Model and the first by the "Defrosted" lineup.
In the aftermath of the band's "freezing" (凍結) in 1988, P-Model's members went their own separate ways. Frontman Susumu Hirasawa built the "Defrosted" (解凍) lineup out of his solo backing band. Hikaru Kotobuki, the group's last keyboardist before its "freezing", kept working with Hirasawa as his touring keyboardist. He also introduced Hirasawa to the Amiga sequencing program "Bars & Pipes".
Founding member Katsuhiko Akiyama reconnected in 1987, playing bass in 2 shows that year as part of the "One Pattern Band", a special lineup of the band were the still active founding members plus Keralino Sandorovich and former P-Model keyboardist Shunichi Miura (both from Uchoten) performed songs from the group's first 3 albums, which mostly disappeared from their setlists. Akiyama later founded the band Here is Eden, whose debut album was set to be produced by Hirasawa, who in the end only worked on 2 songs; Akiyama went on to appear on Hirasawa's album The Ghost in Science and to be the live bassist for the album's accompanying tour. A 1990 show on the "Error Force" event was billed to "P-Model", but was essentially a "One Pattern Band" show, with Miura replaced by Kotobuki and with both former P-Model drummers.