If you're a student of early music, there are various books you shouldn't be without. I'd say this is one of them; if it isn't, it comes close, and how can you beat the price? What you have here is an inexpensive score for one of the great liturgical dramas of the Middle Ages, with lyrics done in very legible calligraphy, with commentary on the play and its historical background by Noah Greenberg himself. If I were to suggest improvements, they'd be two in number: first, a binding that would lie flat, and second, PLEASE update the address to which one should write for permission to perform the play. (At the very least, it should use the ZIP code that was adopted a few years after 1958 when the book was first published.)