STAŘÍ PSI (= OLD DOGS), previously PROMĚNY, that´s a group of musicians, friends, who have been chummy together more than 30 years. They started with a music of John Mayal and Ten Years After in 1970, so as then to be influenced by hardrock of legends like Deep Purple, Led Zeppelin and all its other branches. Enriched with these musical influences, they came back now into the bosom of blues. In their musical life they enjoyed a big popularity with listeners of several generations without ever pandering to popular taste by commercial way. PROMĚNY always used to be a guarantee of musical, sound and also repertory quality. Not by chance they were therefore invited for common concerts with the English URIAH HEEP, YARDBIRDS, KEN HENSLEY or the Polish SBB.