Rovo is a psychedelic rock-jazz band founded in 1996 in Tokyo by former Boredoms guitarist Seiichi Yamamoto (山本精一), electric violinist Yuji Katsui (勝井祐二), and synthesizer/effects technician Tatsuki Masuko (益子樹), with Jin Harada (原田仁) on bass guitar, Hiroshi Nakanishi (中西宏司) on synths, and featuring two drummers/percussionists, the prolific Yasuhiro Yoshigaki (芳垣安洋) (of legendary improv noise group Ground-Zero) and Yoichi Okabe (岡部洋一).
There are four different bands named Altered States, listed in order of popularity: a Japanese free/noise jazz / avant-prog group from the 90s, an 80s gothic rock band, a Bass music production trio from Manchester and a psychedelic rock band from Dallas. 1. If pure musicianship is the guiding criterion, Altered States are arguably one of the greatest guitar/bass/drums trios in the history of rock, which may strike some as an overstatement but the evidence is there for anyone willing to seek out the band's Japanese label releases.