mc-modulation

Use a cushion chord, most commonly the target key's V or V7, placed in the last one or two beats before the modulation and resolved across the barline into the new key's tonic. The Skill provides a five-level announcement scale from plain V up to dim/aug stand-ins and slash chords.

A cushion chord is a transition chord that makes a key change sound smooth, typically the target key's dominant placed just before the seam. It is usually a chromatic chord in the original key, which signals to the listener that a change of tonal color is coming.

The half-step-up final chorus lift is flagged as an overused default, especially in generative models. Alternatives include a whole-step-down move for finale weight, a minor-third-up lift, a parallel-key light/dark switch, or changing the arrangement instead of modulating.

Tonicization (using secondary dominants or borrowed chords briefly) is not modulation; the criterion is whether the music stays in the new key afterward. Inserting an E7 and returning to C is tonicization, while remaining in A major afterward is modulation.

Plan the return trip explicitly: turn the new key's tonic into a dominant seventh (I to I7) or into the original key's IIm, then use a secondary dominant or two-five-one to come home. This return step is the most commonly missed part of modulation design.

Dominant and subdominant keys (a fifth away) share the most common chords and are the smoothest, followed by relative major/minor keys sharing a key signature. Tritone relationships are the most distant and require bridging with tritone substitution for dramatic effect.