What was the contribution of the "quiet Beatle" to a song Ian McDonald described as having "rich and unusual harmonic motion"?
Yes It Is:  It features some of the Beatles' most complex and dissonant three-part vocal harmonies and showcases George Harrison's early use of volume pedal guitar. Yes It Is:  Ian MacDonald describes the song as having "rich and unusual harmonic motion." George Harrison:  Often referred to as "the quiet Beatle", Harrison embraced Hinduism and helped broaden the horizons of his fellow bandmates as well as their American audience by incorporating Indian instrumentation in their music.
use of volume pedal guitar