437. CHROMATIC WAVES OVER A CHORD WITH WAVELENGTH INTERVALS OF 3RDS OR 4THS.

 Chromatic waves over a chord is a a nice concept to create continuously moving melodic themes with many notes over a chord. 

Such a chromatic wave is defined by an more or less ascending or descending chromatic sequence (in other words  by intervals of 2nds) of notes such that we stay longer time when we pass from a note of the underlying chord (thus creating waves by intervals of 3rds or 4ths defined by the underlying chord). The middle note (in normal position) of the underlying chord is the most characteristic note of the chord that defines if it is minor or major , blue note or not. Thus such chromatic waves wit wavelength intervals of 3rds move from middle note of a chord to the next middle note of the next chord.