This fifth edition of Harmony marks the forty-fifth year of its successful use. The major departure of the fourth edition was the addition of seven new chapters, including four on the complicated subject of harmony after common practice, which had not been discussed in the first three editions. The core of the book, however, remains the exhaustive treatment of common-practice harmony, which will still be the basis for most one-year or two-year courses in tonal harmony. In the present edition the entire text has been carefully examined, with a view especially to clarifying the language whenever possible. A few topics of relatively lesser importance have been deleted, and a number of duplicative examples have been trimmed.