Figure 7.3.6. An interpretation of two passages from Bach’s Af major fugue from WTC II. (a) Measures 6-7 involve the “down a third, up a step” sequence, whiles mm. 13-15 involve the descending fifths sequence (b). In the original music, the middle voice of (a) and the top voice of (b) involve sixteenth-note figuration; thus the chromatic descent moves from soprano (a) to middle voice (b).