A collection of sacred music performed at the church of St Johann Nepomuk in Vienna from the beginning of the 19th to the middle of the 20th century. The music includes works written by classical composers, mainly Joseph Haydn, Michael Haydn and W. A. Mozart. The individual works come in sets of full, vocal or short scores with vocal and instrumental parts, although sometimes the sets are incomplete.

The manuscripts are written by various hands in different dacades, 1830s-1950s. At least three copyists are represented more frequently. Most manuscripts are stamped with an oblong stamp 'Kirchenmusikverein St. Johann Nep., 11 Praterstrasse, Wien' and a few with a round stamp 'Der Prater Strasse, Pfarre St Johann'. The stamp of 'Carl Winkler, Kapelmeister, Wien, IX, Georgsiglgasse 10/6' appears on a few other copies. A handful of printed parts can be found among the manuscripts.

The folders and wrappers, in which the music is held provide short titles and numbers which most likely follow the sequence in the church's music library. On the folders and wrappers are written lists of the parts present with dates of their stock-takings. Occasionally, an ownership inscription appears on the first page, the notable being that of Johann Baptist Ziegler (1823-1878).

A number of scores and parts contain performance markings. Some parts, especially vocal, include dated signatures of the performers.