MANDATORY is a progressive thrash metal band from Linz / Austria. The origin of MANDATORY can be traced back to the year 2002 when the original members Chris, Leo and Manuel where completed by drummer Mike. After releasing their critically acclaimed 4-track EP “Concept of Chaos” in 2006, the band introduced Mike Schedelberger as new lead vocalist in September 2008, and immediately started writing and recording new songs at their own studio.