Atlantis (21)

Czech rock group, formed in 1966 by Petr Ulrych in 1967, the latter soon became the group’s main composer. Performed regularly in West , e.g. as one of the backing bands of the German stage version of musical Hair/Haare. Disbanded in summer 1973.
Known – not all of them performed on recordings though:
Stanislav Regal (guitar, keyboards, vocals), Jan Hubáček (bass guitar), Zdeněk Kluka (drums), Petr Ulrych (lead vocals, guitar), Hana Ulrychová (lead vocals), Oldřich Fiala (guitar), Jiří “Danny” Svoboda (bass guitar), Jaroslav Vraštil (keyboards), Vladimír Grunt (drums), Ivo Křižan (bass guitar, vocals), Miroslav Ryška (bass guitar), Jozef Karpaty (bass guitar), Vladimír Severa (guitar), Ladislav Klein (guitar)