Vulkan ( Volcano )
active from year 1963
rock band from Brno, founded by Ales Sigmund; well known thanks to backing the singers & songwriters duo of Hana and Petr Ulrych, later sisters Marta and Tena Elefteriadu, too. After 1970 performing as Ales Sigmund Band.
Members:
Zdenek Kluka (1963-1965)
Jan Hubacek (1963-1965)
Ales Sigmund (since 1963) , guitars, leader, background vocal, vocal, cymbalo
Petr Ulrych (1964-1967) , vocal
Hana Ulrychova (since 1964)
Martha Elefteriadu (since 1966) , vocal
Tena Elefteriadu (since 1966) , vocal
Karel Antonin (1968-1969) , drums
Bedrich Crha (since 1968) , keyboards
Cyril Kajnar (since 1968) , bass guitar
Jiri Svoboda "Danny", bass guitar
Ivan Sultanov, guitars
Jaroslav Ptacek, drums
Discography:
compilations / live recs.:
Cestou k tichemu hlasu (Story 1964-1976) ( On The Way To Quiet Voice ) ( Ulrychovi, Hana a Petr ) , Supraphon 1991 , 
samplers etc.:
Beat-line , Supraphon 1968 , 
SP / EP:
Tve mesto / Sen ( Ulrychovi, Hana a Petr ) , Supraphon 1967
Wine Of Love / Tam chtela bych byt ( Ulrych, Petr ) , Supraphon 1968
Dancing In The Street / Nejvic ma kdo se umi smat ( Martha a Tena Elefteriadu - Martha and Tena Elefteriadu ) , Panton 1969
Prani deravy lodky / Kdyz ma srdce pust ( Martha a Tena Elefteriadu - Martha and Tena Elefteriadu ) , Discant 1969
Rescue Me / ... ( Martha a Tena Elefteriadu - Martha and Tena Elefteriadu ) , Panton 1969
Vracim se cestou domu / Pojd, pujdem spolu ( Ulrychovi, Hana a Petr ) , DIscant 1969
Zivot je jen nahoda / Prijd ( Martha a Tena Elefteriadu - Martha and Tena Elefteriadu ) , Panton 1969
Pisen pro vas / Boure ( Martha a Tena Elefteriadu - Martha and Tena Elefteriadu ) , Panton 1970
River Deep, Mountain High / Posledni zavej ( Elefteriadu, Martha ) , Panton 1970