The church St. Stephan is a Catholic church in Baden in Lower Austria. The official name is Stadtpfarrkirche St. Stephan. The present building began in Gothic style in the 15th century. It was remodeled Baroque in the 17th century, and an attempt made to restore Gothic features from 1880.
The church has a notable organ, played by Mozart and probably also Beethoven. Mozart's motet Ave verum corpus was premiered in St. Stephan in 1791. The church is a registered monument and an active parish church.
Wikipedia https://en.wikipedia.org/wiki/St._Stephan,_Baden
Coordinates 48°0'35.272" N 16°14'10.94" E