The Whole Tone Scale
The whole tone scale is a symmetrical scale. It’s called “whole tone” because it contains no 1/2 steps. You can start on any random note and play a scale up or down, always making the subsequent note two 1/2 steps (a whole step) away. The characteristic sound is hard to describe; however, you don’t get a sense of tension and resolution. (This is true of any symmetrical scale). You will hear it in movies and programmatic music. Thelonious Monk was one of the first major jazz pianists that seemed to be fascinated by it.