Most books about opera and related subjects are located on the 3rd floor of Morris Library within these call number ranges: M1500-M1527 (scores), ML47-ML50 (librettos), and ML1700-1706 (books about opera).
M - Music - printed music, scores
ML - Literature on music
MT - Musical instruction and study
Important: Some music books are considered oversize (designated as Folio or Folio+). All oversize books are located on the Lower Level of the Library.