The purity and simplicity of Gregorian chant is what fed the musical and liturgical life of Christianity for more than a millennium before there were any Protestants. But after the reforms of the Vatican II concils in the 1960s, chant went into disuse. Gregorian chant is back, and more popular than it has been in the last forty years. This handy book is for musicians of all denominations and levels of ability to sing chant, and to understand it more than ever before. New for the second edition of this classic work are: an entirely new interior design that is easier to navigate and read, many additional chants, and historical and spiritual introductions to each of them.