The Mozarteum is where you receive musical education. It includes a Concert Hall, and there is a Foundation that keeps memorabilia of Mozart, and promotes the Mozart Week Festival, which coincides with Mozart's Birthday on January 27th.
Outside the building are a few statues and art nouveau decoration making it quite an appealing building.
This is an auditorium where you can watch chamber music. The cool interior has some excellent mouldings and is an initmate place for watching concerts and recitals.
I saw Quartet Music of music written by Mahler (when he was 16).