MUSIC THEORY FUNDAMENTALS - Chapter 8, Exercise 2 Solution
==========================================================
Identifying a G major to A minor Cadence in C Major

PROBLEM
-------
A phrase ends with a G major chord moving to an A minor chord, in the
key of C major. Using this chapter's own cadence table and Chapter 7's
own Roman numerals, identify which cadence type this is.

SOLUTION
--------
Step 1 - Identify the Roman numerals. Per Chapter 7's own C major
diatonic chords:

    G major = V (the dominant)
    A minor = vi (the submediant)

Step 2 - Match the motion (V -> vi) against this chapter's own cadence
table:

    Deceptive cadence: V -> vi (instead of resolving to I)

ANSWER: G major moving to A minor, in the key of C major, is a
DECEPTIVE (interrupted) cadence.

----
WHY THIS WORKS AS AN ANSWER

The listener's ear, primed by the strong pull of the dominant (V) chord,
expects resolution to the tonic (I, C major) - exactly what a perfect
authentic cadence would deliver. Instead, the phrase resolves to vi (A
minor) - a different chord entirely, though one that shares two of its
three notes with the expected tonic (C and E are common to both C major
and A minor triads), which is exactly why a deceptive cadence sounds
genuinely surprising rather than simply wrong.