Music theory

Modal interchange borrows chords from a parallel mode to add emotional color.

Tritone substitution replaces a dominant chord with another a tritone away — adding chromatic flavor.

Secondary dominants are dominant chords of any chord other than the tonic — adding pull and direction.

Voice leading is the smooth motion of individual notes between chords — the foundation of professional harmony.

Modulation is the process of changing keys mid-song — refreshing energy and creating drama.

The Circle of Fifths is a visual representation of all 12 keys arranged by perfect fifths.

Syncopation places accents on weak beats or off-beats — creating groove and rhythmic interest.

Polyrhythm layers multiple rhythmic patterns at the same time — creating complex, hypnotic textures.

Counterpoint is the art of combining independent melodies that sound good together.

Melodic contour is the shape of a melody — its rises, falls, and peaks across time.

Tension and release is the heartbeat of music — building dissonance and resolving it.

A cadence is a harmonic conclusion — the way phrases end and breathe.

A pedal point is a sustained note held while harmony changes above it — creating tension and continuity.

Motif development is the technique of varying a small musical idea throughout a piece.

Suspended chords replace the third with a fourth or second — creating ambiguous, hopeful tension.

Extended chords add 7ths, 9ths, 11ths, and 13ths above the basic triad — creating jazz sophistication.

Chord inversions change which note is at the bottom — affecting bass motion and voicing.

Song form is the structural arrangement of sections — verse, chorus, bridge, and beyond.

Chord substitution replaces a chord with a different one that performs the same function — adding sophistication.

Parallel keys share the same tonic but have different modes — like C major and C minor.