The sound of Slavko and Vilko Avsenik’s ensemble (Slo: Ansambel bratov Avsenik, Ger: Slavko Avsenik und seine Original Oberkrainer) had many moving parts that contributed to the legendary sound which evolved throughout their career spanning from the 1950s to the 1990s. Technique, band members, advancements in sound engineering, arrangements by Vilko Avsenik and combinations of instruments evolved with each album and each decade. This includes the evolution of each accordion that Slavko Avsenik recorded and performed with.