Use the Library Online Catalog to find print books, etc. and some e-books, like the O'Reilly (Safari) e-books below.
Broadest MUSIC Classification of Print Books on the shelves :
781.63 (Popular Music) 781.65 (Jazz) 781.66 (Rock Music)
781.6809033 (of the Classical Period, 1750 - 1825)
Within the Vocal area, 782, are some of these topics below :
782.1 (Operas) 782.25 (Sacred Songs) 782.4 (Songs) 782.42166 (Rock Songs)
A biography of a composer, like Mozart, can be found at 780.92 (digits: 92, indicates biography).
A biography of popular singer, Elton John is at: 782.42166092 (Taylorsville-Redwood Campus).
The LIBRARY's ONLINE CATALOG finds call numbers for you.