nehan is a Japanese free improvisation/avant-garde rock quintet formed in 2022. Their performance is initiated by a 9HZ brain wave emitted from a testee who has been brought into a deep meditative state. nehan respond with gongs, typani, tabla and other percussion, crumhorn, bagpipes, oscillator and mellotron, passing tranformatively through a musical prism, from east to west, from traditional folk and classical to rock, jazz, and electronic.