A melody originally consisting of four quavers (eighth notes) for example, is augmented if it later appears with four crotchets (quarter notes) instead.
Performance was degraded only slightly when four crotchets to the right were presented as the ongoing preview, but significantly when only two crotchets were presented.
The ornamented melody in crotchets sings in the soprano above a flowing legato semiquaver accompaniment and gently pulsating repeated quavers in the pedal continuo.
A melody originally consisting of four crotchets (quarter-notes) for example, is diminished if it later appears with four quavers (eighth-notes) instead.
The two outer parts are intricate and rhythmically complex with wide leaps, contrasting with the "cantus firmus" which moves smoothly by steps in minims and crotchets.
The continuous accompaniment in quavers and crotchets is an example of the first of two types of joy motif described by, used to convey direct and naive joy.
