Helen G: Follow this link to see a list of 8 editions of the musical score for CAPTAIN MAC' at WorldCat.org.

Then you will need to click on each title one at a time. Then you can enter your postcode to find a list of libraries near you that hold the item. It will even compute the distance. (I think you will only need to enter your postcode once and then it will be saved in a cookie.)

If you can't figure out how to use WorldCat, go to any library and ask a librarian for help. Nowadays all librarians are familiar with WorldCat. In fact, your local library might be able to borrow the item through interlibrary loan.