The Haus für Musik and Musiktheater (MUMUTH; House of Music and Music Drama) is a multipurpose theater in the cultural center of Graz, Austria. Designed by the Amsterdam-based UNStudio, the gently bulging four-story structure is shrouded by a thin stainless-steel mesh and organized around a load-bearing spiral staircase. Developed by state-owned Bundesimmobiliengesellschaft and opened in March 2009, the 6,200-square-meter (67,000-sf) project features a 450-seat theater alongside a restaurant, rehearsal rooms, and workshops for 2,100 students.