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Secondary dominants are dominant (V) chords that resolve to chords other than tonic (I)—V7/ii, V7/iii, V7/vi—creating brief tonicizations or temporary harmonic shifts away from the primary tonic. Hearing secondary dominants requires recognizing the characteristic tritone quality of dominant seventh chords and their expected resolutions. This extends harmonic vocabulary while maintaining tonal center.
Hear V7/ii resolving to ii in context, then practice other secondary dominants. Emphasize the tritone in the secondary dominant and its inward-pulling resolution. Compare tonicization to full modulation (tonicization is temporary; modulation establishes a new key).
Confusing secondary dominants with modulation—secondary dominants are brief harmonic sidetrips that return to the original key, while modulation establishes a new tonal center. Missing the resolution of secondary dominants because it's subtle or chromatic.
You already know secondary dominants in theory — you can look at a score and label V7/ii or V7/vi. You also know dominant seventh chords by ear, recognizing their characteristic tritone between the third and seventh of the chord. Hearing secondary dominants in real time is essentially hearing that same tritone signal, but noticing that the chord it pulls toward is *not* the tonic you're in. It's a moment of harmonic redirection: the music briefly acts as if a neighboring chord were the new home, then either confirms that tonicization or pivots back.
The aural cue for a secondary dominant is a chromatic inflection — a note that doesn't belong to the current key appears in the harmony. In C major, a V7/ii chord (A7 resolving to Dm) contains C♯, which is not in C major's diatonic scale. That raised pitch creates a new leading tone pointing toward D, and when you hear a tone that feels like an unexpected leading tone pulling toward a chord *other than tonic*, you're likely hearing a secondary dominant. The ear registers this as a brief surge of brightness or intensification before the resolution — like a spotlight falling on a chord that wouldn't normally receive that level of harmonic attention.
The resolution is the confirming signal. After a secondary dominant's tritone, the voice with the raised leading tone steps up by half-step to the root of the target chord, while the seventh of the secondary dominant steps down by step. In V7/ii–ii, you hear C♯ resolve up to D (the new "tonic") and the chord's seventh (G) resolve down to F♯ or some other stable tone. This two-voice resolution pattern is the same one you hear in any dominant seventh resolution — what's new is that it's resolving to a chord other than I. Practicing V7/IV and V7/ii first is effective because those chords resolve to common, stable-sounding chords (IV and ii) that your ear already knows well.
The crucial distinction from modulation is duration and commitment. A secondary dominant tonicizes briefly — one or two chords — and the music continues in the original key without establishing new diatonic territory. A modulation shifts the key center and then *stays there*, establishing new scale material and a new pattern of tension and rest. When you're listening and trying to distinguish the two, ask: does the music still feel like it's centered on the original tonic after the chromatic moment, or has the sense of "home" migrated to a new pitch? If the original tonic still functions as home within a few bars, you heard a tonicization. If the music settles into a new gravity center, you heard a modulation — a distinction your earlier training in modulation detection gave you the vocabulary to describe.
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