
Rather than trying to convey exactly what it is with words, the best way to explain what brightness is is to take a musical scale or chord and either brighten it or darken it!

Rather, the idea of brightness has to do with pitch sets and their relativity to root notes and other pitch sets. This type of brightness has to do with the frequency spectrum rather than with musical notation. When talking about brightness/darkness applied to harmony, we're not describing the timbre of an instrument (a crash cymbal is brighter than a kick drum new acoustic guitar strings are brighter than old ones, etc.). In this article, we'll discuss the idea of musical light: brightness and darkness! The concept of brightness and darkness in music theory is applied to chords, scales, and harmony in general. Brightness and darkness are relative ideas. I call it a spectrum, but it's actually cyclical and doesn't necessarily work with absolutes.

This idea of a ‘musical light spectrum' is really interesting. Musical brightness and darkness is something that has been on my mind lately.
