Polish Radio Experimental Studio is the first official series of CD releases dedicated to the music produced in the legendary Studio. Established in 1957 by Józef Patkowski, it was among the first institutions of that kind in the world with only Paris, Cologne and Milano preceding the Warsaw one. Despite that, unlike their foreign colleagues who quickly became the most important figures of the XX century music, Polish composers working in the Studio are known only to a limited number of insiders. Yet, as Reinhold Friedl, leader of zeitkratzer points out, 'the pieces give the impression of an artistic approach which has never been as strict or ideologically restricted as German electronic music or French concrete music. It seems to me that none of the musicians connected with this studio have had the tendency to limit him/herself to 'electroacoustic music', rather they all have a natural and holistic approach to composing' [see: BR ES03]. This is why the releases give us opportunity to revisit our historical ideas of XX century music with a fresh and inspiring insight.