Dahl collected scores and parts of compositions by other composers and these are contained in the Works by other composers series. Many of these are annotated by Dahl, many are marked for performance by Dahl, and many are signed by their composer. In addition to well known historical figures, there are scores by contemporary composers as well as many of Dahl's USC students. This series includes both ozalid reproductions and original manuscripts, and commercially available scores. Dahl had an extensive library of scores, and the commercial scores included here are those that were either annotated/marked by Dahl or inscribed to him.