在灰野敬二 (Keiji Haino) 所组成过或参与过的组合当中，不失者 (Fushitsusha) 是最重要的一组。原因是，无论在音乐上或意念上，不失者都最能反映出灰野敬二的神秘声响信仰。 Experimental Japanese rock band, formed in Tokyo by Keiji Haino in 1978. Many musicians have passed through the group, including bassists Jun Hamano, Yasushi Ozawa, Tori Kudo, and Mitsuru Nasuno, and drummers Takashima, Akui, Hiroyuki Usui, Seijiro Murayama, Jun Kosugi, and Ikuro Takahashi. Haino has also played outside Japan on several occasions, using local musicians including Charles Hayward, Trevor Dunn and Mike Pride. The group ceased activities during Yasushi Ozawa's illness and subsequent death in 2008, though they started playing live again in 2011 and released a new studio album in April 2012.