Petr Vrba joined the scene of improvised music in 2005 with his collaboration with Slovakian band Eduardo Borsuci In Optima Forma (later Sound brigade). Since then his unrelenting explorations of non-idiomatic improvisation using trumpets, clarinet, vibrating speakers, egg cutters etc., made him one of the most active experimental musicians in Prague. In 2010 he became one of the founding members of improvisational ensemble IQ+1 which released an acclaimed CD "tváří v tvář" in 2011 (in autumn 2013 second album will be released in Polí 5 label). In the same year, he constituted Yanagi duo with experimenter Ryu Hankil (alarm clock, typewriters) and already released "clinamen" CD in 2012. With American musician/composer George Cremaschi (doublebass, electronic) they formed Los Amargados duo which plays with guests like Chris Heenan or Susanna Gartmayer. Since 2012 Vrba also regularly collaborates with sax player/composer from Slovakia Miro Tóth, and explores the possibilities of audiovisual improvisation with SeEun Lee and Ken Ganfield. In 2012 with Cremaschi they founded Prague Improvisation Orchestra. Last year he formed electroacoustic "doppeltrio" with Maja Osojnik (subbass flute, electronic devices) and Matija Schellander (doublebass, modular synthesizer).