Mazer Harmony Singing

If you've ever wondered how to create a vocal harmony part, this book
is the perfect place to start. Susan Mazer teaches the basics of
theory, how to listen to other parts as you sing, the easy way to make
your own arrangements and more. You can try out what you learn with
songs in traditional, folk, sacred and popular styles, and explore the
key composers, singers and groups who shaped the history of harmony
singing.
The included CD lets you hear the various types of harmony and sing
along with examples in the book.