Example 2. Transcription and analysis of combination tones in “Head Rhythm,” with audio slowed 4x. Red boxes identify the sounding pitches that create the difference tones; click on them to see my calculation of difference tones and to hear the direct juxtaposition of the sounded notes and the emergent pitch.

2a. Audio with reduced volume for comfortable listening

2b. Audio at original volume, with combination tones clearly audible—use caution, perhaps lower volume before playing