Use BU Libraries Search which includes deep, full-text searches through many--though not all--publications accessible in our libraries.
The BULS search also pulls performing arts-related titles you may already have in mind,
but with subject-special databases, so much else can be discovered, too:
and continue in interdisciplinary directions
Open stack ranges for book browsing include:
MT 955-956 production and staging; performance skills, preparation
ML 1707-2054 general and also specific works on opera, music theater
The Cambridge Companion to the Musical
by
The expanded and updated third edition of this acclaimed Companion provides an accessible, broadly based survey of one of the liveliest and most popular forms of musical performance. It ranges from the American musical of the nineteenth century to the most recent productions on Broadway, in London's West End, and many other venues.
These open access portals link you to digital representations of original source material.