Famous for its orchestra and its acoustics (among the top ten in the world), this is one of the world's most frequently visited concert halls. Classical music is the main fare, but they also bring other kinds of music on stage. They have a free "lunch concert" on Wednesday from 12:30 till 13:00. In the same building is the "Kleine Zaal" ("Small Hall") for more intimate performances, often top-notch as well. It's worth a visit if only for its architecture.