f(t)18 / 35Drift phonk
f'=fc/(c-v)
Why a passing siren drops in pitch.
The equation
f′ = f · c / (c − v)
What the equation decides
Every lead note is one passing car. The faster the car, the bigger the fall, so the melody is really a sequence of speeds.
What was composed
Hook rhythm, the order of speeds, chords, tempo and drums.