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About Altered Sevenths

All five sevenths, including the two that pull hardest.

Part of Ear Training on instrument.games. It runs in the browser, scores every run, and needs no account to play.

How to approach it

  • Half-diminished is a diminished triad with a minor 7th on top — tense underneath, soft above.
  • Diminished 7th stacks minor 3rds all the way up, so it sounds the same from every note of it.

More Ear Training levels

Ascending Basics

Steps, skips, and perfect intervals moving upward.

Descending Basics

The same core intervals, heard falling instead of rising.

Harmonic Intervals

Two notes at once — hear the blend, not the motion.

Major vs Minor Triads

The two workhorse chord qualities, blocked and arpeggiated.

Color Chords

All four triad qualities, including the unstable ones.

Mixed Advanced

Every interval, both directions, melodic and harmonic.

Seventh Chords

The three sevenths that carry most tonal music.

Triad Inversions

Same three notes, different note underneath them.

Level by Demo Maestro · Published August 1, 2026