Czech pop group. Formed 1971 Former members : Šíp Karel - bass guitar (1971 - ) Uhlíř Jaroslav - keyboards (1971 - ) Schelinger Jiří - guitar (1971 - 1973) Šemnický Zbyněk - drums (1971 - 1975) Milota Václav - tenorsax (1971 - 1974) Other members: John Jan - guitar (1974 - ) Pátek Arnošt - vocals (1975 - ) Holanová Marcela - vocals (1975 - ) Vávra Vítězslav - drums (1975 - ) Zemánek Boleslav - vocals (1975 - ).