The jewel in Ossiach's crown, the church is also the centre of the Festival's musical activities. It is the place where concerts of soloists and chamber music ensembles are played and, of course, this also is where the Festival's famous scenic productions of musical dramas, the so-called church operas, are staged. The church is known for the lavish decorations of its interiors, which show the art of late Baroque style at its peak and make it stand out even among so many beautiful churches in Carinthia. The walls and ceiling are covered with stucco work (Wessobrunner School of Upper Bavaria) and fresco paintings (by Carinthia's most prominent Baroque painter, Josef Ferdinand Fromiller), both performed with a maximum of decorative perfection and marked by great stylistic uniformity. Spatial rhythm, tenderness of colours, a cheerful character, ideal acoustics, and the intimacy of the room make this church "the world's most beautiful concerthall" (Leonard Bernstein).