There are said to be approximately 2,500 public theaters and concert halls in Japan at present. Almost all of these were built in the 1980s or later. There was an unprecedented rush of construction in the 1990s in particular, when approximately 1,000 halls opened during a ten-year period. The building of such a large number of facilities in the 1980s and 1990s took place in a context not only of government support for public works projects but also as a result of a number of broader movements.
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http://www.performingarts.jp/E/overview_art/1.html