The Circle of Fifths (also referred to as the Circle of Fourths depending on the direction you’re moving on it) is a powerful visual tool for musicians. The Circle of Fifths is a visual representation of all the musical keys and their relationships to each other. The Circle of Fifths is most useful for finding the key of a song, transposing songs to different keys, composing … [Read more...] about Theory in 300: The Circle of Fifths