New York Public Library for the Performing Arts.
In 2 Shout NY guides.
Music
Classical Music in New York: How to Go, Cheaply
Tucked between the Vivian Beaumont Theater and the Met Opera, this library branch houses an absurd archive of sheet music, recordings, and history.
Go for: Niche historical performances, daytime recitals, and masterclasses from groups like the New York Classical Players.
Books + Ideas
The Best Libraries in New York City to Read, Work and Wander
Located at Lincoln Center, this NYPL branch is a treasure trove for anyone interested in theater, music, and dance.
Go for: The Theatre on Film and Tape Archive, deep collections on music and dance.