Modrý Efekt – Je třeba obout boty a pak dlouho jít (1972)

Modrý Efekt (The Blue Effect) – Czech rock group, led by guitarist and composer Radim Hladík. Formed in autumn 1968 as the immediate successor to The Matadors, initially disbanded in 1990. Since the early 2000s they were actively performing in a new lineup until September 2016, shortly before Hladík’s death.