Have you discovered the online Naxos Music Library yet? In addition to an excellent classical music catalogue the database also has a wide selection of musicals online. For example you can listen to original Broadway cast recordings for:
Annie Get Your Gun
Call Me Madam
The King and I
Kiss Me Kate
Paint Your Wagon
South Pacific…and many more. - Music Library Blog of Chichester University
Visit the Naxos Music Library today and search in ‘Genres’ > ‘Classical Music’ > ‘Musicals’ for further titles.