| Each title has been individually catalogued and interfiled into the general music collections. |
| Unlike most directories, the company names have been interfiled in alphabetical order with the actual trade names, which are similarly listed. |
| Classical, pop, and jazz formats are interfiled in this very eclectic listing. |
| Cards for recordings were interfiled with cards for books, so that all curriculum-supporting materials could be found in one index. |
| Reference and nonreference books are interfiled without distinction. |
