In the Music Division, the vast majority of publisher catalogs are classified under the old Billings classification system (used for classification prior to 1972) where the call number/classmark begins with an asterisk:
*MCP
The Music Division has thousands of publisher catalogs. Most of them are not cataloged or inventoried and thus can not be found through the catalog. Names of individuals and firms have not been regularized based on standard use. One can submit a call slip with the classmark *MCP and put down the name of a publisher to see what the Division has. For example:
Class mark: *MCP
Author: Eulenburg
In the case of publishers who used their name as part of their corporate name (such as C.F. Peters, later commonly known as Edition Peters), one should submit slips with a variety of options:
C.F. Peters or
Peters, C.F. or
A portion of the Music Division's publishers' catalogs