Two institutions share the address in this building finished just before World War I—the International Foundation Mozarteum, set up in 1870, and the University of Music and Performing Arts, founded in 1880. Scholars come here to research in the Bibliotheca Mozartiana, the world's largest Mozart library (for research only; public access allowed with advance registration). The Mozarteum also organizes the annual Mozart Week festival in January and the forward-looking Dialogues festival in December, selecting two composers each year, one contemporary and another historic, to intermingle with Mozart works, aiming to spark conversation and bring fresh perspectives to the pieces. Many important concerts are offered from October to June in its two recital halls, the Grosser Saal (Great Hall) and the Wiener Saal (Vienna Hall).
Behind the Mozarteum, sheltered by the trees of the Bastiongarten, is the famous Zauberflötenhäuschen —the little summerhouse rumored to be the
place where Mozart composed parts of The Magic Flute, with the encouragement of his frantic librettist, Emanuel Schikaneder, who finally wound up locking the composer inside to force him to complete his work. The house has more former addresses than most Salzburgers, having been moved numerous times around Salzburg after being donated to the Mozarteum by Vienna's Prince Starhemberg. It is much restored: back in the 19th century, the faithful used to visit it and snatch shingles off its roof and later it was damaged during World War II bombings. The house can generally be viewed only when concerts are offered in the adjacent Grosser Saal.