Publisher Desc. Every song is based on a basic chord structure upon which the melody relies for overall feeling and sound. Altered chords (variations of the original chords) make a song sound even more rich and professionally arranged. Frank Mantooth has written this series of books to give pianists the very best chord changes for some of the most beautiful songs ever written. Each song includes the melody line, chord symbols, and a second line of altered chords printed above the original chords. These valuable collections also include playing tips, music examples and harmonic analysis as well as historical annotations.