Martin Koubek was czech musician (guitar, harmonica, drums) and composer ...member of The Heartbeat, Regrese, Proměny, Pražský Výběr Michaela Kocába, The Blue Effect, Framus Five.

DUX was czech hard rock group. Formed in 1985 in Prague by guitarist and songwriter Martin Koubek. (lineup 2003: Martin Koubek /vocals, guitar, Michal Němec /bass guitar, Ondřej Čepelák /keyboards, Martin Hložek/ drums)....album Clowleys Music Shop was recorded and mixed from 2006 to 2009, mastered 2010 at Bellatrix studio.