Rhythm and Flow - Frame-by-Frame Stop Motion: The Guide to Non-Traditional Animation Techniques - page 123

Fig 9.2 a waveform from sound in Dragon Stop Motion.
Patterns of Movement
One can consider frames of animation like musical notes on a scale. This is
especially true when visuals are closely linked to sound tracks. Generally,
when a waveform rises in size on the audio track, the corresponding visual
frame is active or more detailed, reflecting more energy and dynamic. If
the sound recedes, then the corresponding image may remain static with
little dynamic change. One master of this approach to visual music was
Norman McLaren and his many film experiments, including his 1959 Short
and Suite and the 1971 Synchromy . McLaren used many different techniques,
including drawing directly on 35 mm film with pen and ink. He also used
optical printing techniques in Synchromy to create a direct visual link to the
sound track.
Fig 9.3 an active sound track and the corresponding visual timeline.