Quick Tips for searching ACORN
1)Use the “Advanced Search”
2)If you are searching for a “genre-type” piece, such as a sonata or symphony, pluralize the genre.  Sonatas or Symphonies
3)The music library has the same work in many formats, make sure you specify which format you are seeking. 
4)Search on the “official” title when possible.  Use opus or Koechel or BWV numbers when possible.