Premise: P-Model (also typset as P-MODEL and P. Model) was a Japanese 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. P-Model officially disbanded in 2000, although many of its members continue to release solo albums and collaborate with each other on different projects.
Hypothesis: P-Model disbanded after 21 years.