The Library utilizes the Library of Congress Classification System. If you want to browse the shelves, here are areas to start:
GV1580-1799.4 Dance
GV 1588 - Dance Philosophy (and theory)
GV 1600 - Dance criticism, appreciation
GV 1645-1728 - Dance history (and historical dance)
NK4700-4890 Costume
PN1600-3307 Drama (general)
PN1720-1861 Theatre History
PN2061-2071 Acting