Essential Terms for Major Key Harmony Explained

What is the structural relationship between the tonic, subdominant, and dominant chords in a major scale?

These three pillars form the framework of functional harmony by establishing a cycle of tension and release that governs the movement of musical phrases.

• Tonic (I): Acts as the center of gravity, providing the ultimate point of stability and rest for the listener.
• Subdominant (IV): Functions as the departure point, moving away from the tonic to create momentum without the urgency of a resolution.
• Dominant (V): Creates high-intensity instability through the tritone interval, demanding a return to the tonic to satisfy the ear's expectation.

How do functional harmony concepts define the roles of primary and secondary chords?

Primary chords—the I, IV, and V—establish the tonal identity of a key by defining its center, its departure, and its tension. These chords are the structural foundation, appearing most frequently to ground the listener. Secondary chords, such as the ii, iii, and vi, serve as harmonic coloring agents that extend or delay the arrival of primary functions. They provide a softer, more nuanced path between the pillars of the key.

For example, a ii-V-I progression uses the subdominant-like ii chord to smooth the transition toward the dominant. However, a nuance exists in the vi chord, often called the deceptive resolution. While it is a secondary chord, it can act as a tonic substitute because it shares two notes with the I chord, allowing composers to trick the ear into feeling a sense of arrival where none was intended.

What distinguishes diatonic chords from chromatic alterations within a major key?

Diatonic chords utilize only the seven notes native to the major scale, while chromatic alterations introduce notes from outside that scale to heighten tension or modulate to new keys. Diatonic harmony sounds naturally settled, whereas chromaticism adds color and direction. A lot of people assume that chromaticism is inherently dissonant, but in practice, chromatic notes often act as passing tones or leading tones that make the resolution to a diatonic note feel more satisfying and purposeful.

How does the concept of cadences determine the resolution of harmonic progressions?

Cadences function as the punctuation marks of music, signaling the end of a phrase or a section through specific chord successions. The authentic cadence, moving from V to I, provides the strongest sense of finality, effectively closing the harmonic thought. Other types, like the half cadence ending on V, leave the progression feeling open or incomplete, which encourages the listener to expect further musical development.

A common example is the perfect authentic cadence, where the root of the V chord moves to the tonic and the melody resolves to the root of the I chord. A notable nuance is the deceptive cadence, where the V chord moves to the vi instead of the I. This subverts the listener's expectation of closure, effectively extending the phrase and forcing the music to continue toward a later resolution.

What is the significance of the circle of fifths in determining key signatures and harmonic relationships?

The circle of fifths maps the relationships between keys by showing how many sharps or flats exist in each signature. Moving one step clockwise adds one sharp, while moving counter-clockwise adds one flat, with the tonic of each new key appearing a perfect fifth apart.

How are seventh chords categorized based on their function within a major tonality?

Seventh chords add a layer of complexity to functional harmony by introducing a dissonant interval that requires specific resolution to reach a stable state.

• Major 7th (IMaj7): Provides a dreamy, stable sound that functions as an expanded tonic, often used in jazz to soften the finality of the I chord.
• Dominant 7th (V7): Contains a tritone between the 3rd and 7th scale degrees, creating the strongest possible drive toward the tonic.
• Minor 7th (ii7): Acts as a gentle, pre-dominant color that prepares the ear for the arrival of the dominant chord.
• Half-Diminished (viiø7): Functions as a substitute for the dominant, providing a darker, more unstable sound that resolves easily to the tonic.

What role does voice leading play in connecting chords while maintaining harmonic clarity?

Voice leading ensures smooth transitions by minimizing the movement of individual notes between successive chords. By keeping common tones in the same voice and moving others by the smallest possible interval, typically one or two semitones, the harmonic progression retains a clear, logical flow.

How do secondary dominants expand the harmonic vocabulary of a standard major key progression?

Secondary dominants act as temporary V chords, borrowing a dominant function to tonicize a non-tonic chord within the key.

Use these relationships to increase the harmonic tension of a progression by preceding a target chord with its own unique dominant.