The song is in moderate time in C major and is characterised by the bassline moving stepwise downwards in a repeated pattern throughout. In classical music this is known as a ground bass. The similarity between the Hammond Organ line of "A Whiter Shade of Pale" and J. S. Bach's Air from his Orchestral Suite No. 3 2. Air, BWV 1068, (the "Air on the G string"), where the sustained opening note of the main melodic line flowers into a free-flowing melody against a descending bass line, has been noted. David Knights – bass