Sonority refers to
pitches. An interval
is the most basic
Example 7.04 is an updated version of the chart first presented in Triads and Harmonic Analysis in
example 5.07. It now includes analysis of diatonic seventh chords for major keys.
Clavier, Prelude I, BWV
846: J.S. Bach, 1722.
To help with analysis, the chords in example 7.15 are shown in simple position reduction in example
7.16 below. Example 7.17 that follows shows the excerpt with a textural reduction. Textural reduction
is similar to simple position reduction except that it retains all octave designations of all notes present
instead of reducing them by pitch class.
At other times, composers may use figured bass to indicate notes that are not part of the harmony.
Although these nonharmonic tones will be studied in detail in the next section, it is worthwhile to have a
present awareness of them in figured bass.
demonstrated in example 7.38. The inner voices (alto and tenor) appear without stems to indicate
that they are the realization of the figured bass.