This 188-page book uses the four flute concerti of C.P.E. Bach and their nearly identical harpsichord versions as models to examine C.P.E. Bach's and Quantz's advice about a variety of appoggiaturas and trills: how to recognize the type of appoggiatura or trill that one might find in music of the mid-eighteenth century and how to determine the execution of the ornament that will best enhance the musical phrase. The book extracts, organizes, and compares the sometimes conflicting advice of C.P.E. Bach and J.J. Quantz regarding just about every type of appoggiatura, trill, and hybrid ornament that the two musicians discuss throughout their treatises. It lends insight to the differences in performing the ornamentation found in the baroque music of J.S. Bach's era versus the rococo music of C.P.E. Bach and his contemporaries, or music from the classical period, including Haydn and Mozart. Numerous musical examples are included throughout the book, and there is a comprehensive index for quick reference of a particular ornament or ornamentation concept.