For about $20.00, (shipping included,) I purchased Bill Tortolano's little book on Gregorian Chant. The publisher, GIA, suggested that it contained "everything you need to know" about the topic, in the utilitarian sense--that is, one could, after reading the book and with some preparation, actually sing and/or train and conduct singers in the use of Chant. That's true. It's an easy, short read, and contains all the technical gobbledygook one needs; for that purpose, it's worth the money. Tortolano also includes a number of common Chants for the Mass, a few hymns, a Latin pronunciation guide, the Psalm-tones, etc.--enough to...