Chord-quality ear training is naming a chord's quality from its sound alone

Chord-quality ear training is the perceptual skill of hearing a simultaneously-sounded stack of notes and naming its quality — major, minor, diminished, augmented, dominant 7th, suspended — without seeing the notation or analyzing it. A chord is three or more notes played together, and its quality is set by the intervals stacked above the root (major third + minor third = major triad; minor third + major third = minor triad). Because quality is carried by those internal intervals, this skill builds on interval ear training: the learner hears the third that flips a triad between bright (major) and dark (minor), and the symmetrical, unstable sound of diminished and augmented chords. It is distinct from knowing chord theory: the goal is recognizing a chord’s colour immediately and perceptually, not deriving it. It is trained like interval recognition — hear, respond, get feedback — until recognition is instant rather than analytical.

Examples

Play a C major then C minor triad back to back and listen for the third moving down a half step. Diminished triads sound tense and unresolved; augmented triads sound suspended and ambiguous because both stacked intervals are equal. CMaj7 is wide, open, floaty; Cm7 is dark, introspective; C7 is bluesy and wants to move.

Assessment

Given 10 root-position chords played in random order, label each as major, minor, dominant 7th, diminished, or augmented at 8/10 accuracy without seeing the keyboard. Then explain which single note distinguishes a major triad from a minor one, and what sound property distinguishes a diminished chord from a minor one.