Classic tune “Nature Boy” performed on a theremin
Written as a pop ballad, “Nature Boy” follows an “A,B” format, with both sections being melodically and harmonically similar until the final 4-bar phrase of each. The primary melodic theme is a pickup note on the 5 of the minor i chord, then three notes descending on a minor triad above the pickup note. An ascending line over the diminished ii chord returns to the initial minor triad.
The harmonic structure makes frequent use of the standard ii-V-i progression in the key of D minor. The second 4-bar section featured a chromatic descending line based on the lowering of the tonic (Dm, Dmmaj7, Dm7, Dm6). The same descending line then continues through Gm6, Dm, then finally ending with a whole-step down to the G in the chord Em