In one episode of the Britcom “Red Dwarf“, a robot suggests that the traditional 7-pitch musical scales should be changed into a 10-pitch scale, making it work with the metric system. In this show, this is suggested as a joke, and is accompanied by that truly horrific laugh-track that accompanies any Britcom. But it’s really an interesting idea, if you think about it.

It’s nothing new, though. People have been messing around with scales for ages. For example, most people are familiar with the sound of a pentatonic scale, which is used in every culture in the world (but western children will usually say that it sounds “Asian”.) And then there’s the octatonic scale, a favorite among jazz musicians and late romantic composers. Claude Debussy continued this tradition of scale-play by stretching standard tonality to its limits. In his piano composition, Voiles (meaning “veils), he uses a 6-pitch scale called “whole tone.”

The effect is marvelous – it feels like we are floating! On one hand, we have a sense of a tonal center (a “home key”) thanks to the pulsing bass, and simple melodic figures. But on the other hand, a couple more pitches in the scale, and we begin to question where we really are.