Son Et Lumiere, a puzzle

Can you solve this fiendish picture puzzle which emerges from The Dreams Of Gerontius? Click the image for the full size version.

Your only clues are:

Pairs point to a wheel of colour circling five tones.
The true answer leads to a road of sound and light.

The table on the right is there to help those who are colour blind.

Good luck.

Leave a comment if you get the answer. I’ll let you know if you’re right but will edit out spoilers for those who come after.