As the church was badly damaged during Ottoman wars, its interior was changed to Baroque style, installing several altars.

[1] During the 18th century, some side altars were added, including the Sebastianaltar which was dedicated by the Baden citizens in 1731 to fight the plague.

[3] It was restored in 1987 by Gerhard Hradetzky [de] from Oberbergen, re-using keys which Mozart and probably also Beethoven played.

[2] Mozart participated in several performances of his masses at the church and was a friend of the choral conductor Anton Stoll.

On 17 June 1791, Mozart composed for Stoll the motet Ave verum corpus, K. 618, which was premiered by the church choir in St.

[4][5] The musicologist Christoph Wolff assumes that it was performed probably on or around the feast Corpus Christi, on 22 June that year, and repeated at the Vienna Cathedral.