Which tonal relationship shares the same key signature as its major counterpart and is easy to modulate to by using a shared chord?

Which tonal relationship shares the same key signature as its major counterpart and is easy to modulate to by using a shared chord?

• A. Relative minor
• B. Parallel minor
• C. Relative major
• D. Enharmonic

Answer: (A)

The idea here is how a relative major/minor pairing shares the same key signature and can be moved between smoothly using a common chord. The relative minor is the minor key built on the sixth degree of its major scale, so it uses the same set of pitches as the major key. That shared pitch collection means both keys have identical key signatures. Because a chord that belongs to both keys can serve as a pivot, modulation is especially easy. In the example pair, the chord built on the sixth degree (the vi in the major key) also functions as the tonic chord (i) in the relative minor. So you can pivot on that common chord and shift the tonal center to the minor key without introducing new accidentals or abrupt changes. That’s why the relative minor fits: it naturally shares a key signature with its major counterpart and enables smooth modulation through a shared chord. The other relationships either require a different key signature (parallel minor) or don’t hinge on this shared-pitch, common-chord pathway.

The idea here is how a relative major/minor pairing shares the same key signature and can be moved between smoothly using a common chord. The relative minor is the minor key built on the sixth degree of its major scale, so it uses the same set of pitches as the major key. That shared pitch collection means both keys have identical key signatures.

Because a chord that belongs to both keys can serve as a pivot, modulation is especially easy. In the example pair, the chord built on the sixth degree (the vi in the major key) also functions as the tonic chord (i) in the relative minor. So you can pivot on that common chord and shift the tonal center to the minor key without introducing new accidentals or abrupt changes.

That’s why the relative minor fits: it naturally shares a key signature with its major counterpart and enables smooth modulation through a shared chord. The other relationships either require a different key signature (parallel minor) or don’t hinge on this shared-pitch, common-chord pathway.