Look in the left column to find out which notes you will play for the section. The Purple Color Corresponds to the entire section’s colors for each chord labeled at the top of each column. Columns are alternated Red & Blue for easier viewing. Darker & Lighter Colors in each columns are also for ease of reading. Gray just shows the rest of the scale. This goes to 13th for Piano. W, H, etc show the steps on the scale, whole or half etc.