Tonicization is the most common type of chord substitution, where a chord from a different key is temporarily introduced to create a sense of harmonic tension and resolution.

In modal interchange, chords are borrowed from a parallel scale, creating a modal mixture that adds color and variety to the harmony.

Secondary dominant chords are used to create harmonic tension by temporarily introducing a dominant chord that resolves to a non-tonic chord.

Parallel chords are chords that have the same root note but different qualities, and they are typically a perfect fifth apart.

Tritone substitution involves replacing a dominant chord with a chord that has a tritone relationship with the dominant's root, creating a sense of harmonic tension and instability.

Tonicization refers to the temporary introduction of a chord from a different key, creating a sense of harmonic tension and resolution.

Diminished chords are often used in chord substitution to create harmonic tension and instability, leading to a sense of resolution when followed by a more stable chord.

In modal interchange, chords can also be borrowed from a relative scale, creating a relative substitution that adds harmonic color and variety.

Secondary dominant chords typically resolve to a non-tonic chord, creating a sense of harmonic tension and movement.

Tritone substitution involves replacing a dominant chord with a chord that has a tritone relationship with the dominant's root, creating a sense of harmonic tension and instability.

Parallel chords are often used in chord substitution to add color and variety to the harmony, while maintaining a sense of harmonic stability.

Tritone substitution chords typically resolve to a non-tonic chord, creating a sense of harmonic tension and movement.

Relative substitution involves temporarily introducing a chord from a relative scale, creating a sense of harmonic color and variety.

Chromatic mediant chords are often used in chord substitution to modulate to a new key, creating a sense of harmonic movement and transition.