During German occupation of Czechoslovakia Duba began to appear at stage as a guitarist with dance orchestras.
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In the 1960s, Duba's band accompanied popular Czech singers, such as Josef Laufer, Karel Gott, Yvonne Přenosilová, Karel Hála, Hana Hegerová and Josef Zíma.
Karel Gott | Karel Čapek | Karel Appel | Karel Teige | Karel Reisz | Karel Goeyvaerts | Karel van Mander | Karel Václav Rais | Karel Husa | Karel Roden | Karel Kovařovic | Karel Halík | Jan Karel Lenstra | Karel Zeman | Karel van der Toorn | Karel Svoboda | Karel Štěpánek | Karel Píč | Karel Marquez | Karel Kryl | Karel Kroupa | Karel Jaromír Erben | Karel Zich | Karel Vasak | Karel van Wolferen | Karel Van Mander | Karel Stepanek | Karel Schulz | Karel Plicka | Karel Otčenášek |