Circle of Fifths: The circle of fifths is a visual representation of the relationships between keys based on the interval of a perfect fifth.
Cadential 6/4: A cadential 6/4 progression is a specific type of harmonic progression commonly used at the end of phrases or sections to create a strong sense of resolution.
Secondary Dominant: A secondary dominant is when an altered chord from outside of the current key acts as if it were temporarily functioning as its own dominant chord.