ARSO Ensemble is made up of the leaders and soloists of the Podkarpacka Philharmonic Orchestra - Robert Nasciszewski and Orest Telwach (violin), Anna Nasciszewska (cello) and Slawomir Ujek (double-bass). The ensemble plays Rossini's lesser-known Six sonatas a quarttro, penned by Rossini in 1804 at the age of 12.