不失者 (Fushitsusha) is a Japanese rock band specialising in the psychedelic rock and noise rock genres. The band consists of electric guitarist and singer Keiji Haino (灰野敬二), and a shifting cast of complementary musicians. The group released the majority of its material in the 1990s. Haino founded Fushitsusha in 1978 in Tokyo, Japan, although their first LP was not released until 1989. The band initially consisted of Haino on guitar and vocals, and Tamio Shiraishi on synthesizer.

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