Strata is a meditation on a simple harmonic gesture, a I-V-I modulation, using justly tuned intervals and pure sine waves. A justly tuned A-major, C-sharp Major, and E Major provide the initial pitch content. These pitches swirl against one another and are then slowly concatenated and replaced by pitch sets from major chords a perfect fifth away (3/2). Though the pitch sets from each chord are presented from various bands of their respective harmonic series. As the modulation progresses, the tones are derived from “higher up” within their harmonic series. The initial major chords are then presented from two other perspectives: tuned filters on noise and their rhythmic equivalents (sub audio frequencies).