Harmony Lab

What your child will figure out

• Hear and manipulate pitches as one simultaneous vertical stack rather than a left-to-right melody.
• Measure intervals by semitone distance and alter major/minor quality by changing the third.
• Build and explain an inversion that retains chord pitch classes while changing bass and order.
• Construct a target chord and evaluate common tones and movement independently from chord correctness.

The levels

1. Open rehearsal

   Freely drag and hear three creature voices as one simultaneous pitch stack.

2. Interval shadow

   Tune two voices from a perfect fourth to a seven-semitone perfect fifth.

3. Change the third

   Turn C major into C minor while observing the changed third structure.

4. Turn it inside out

   Build first-inversion C major without changing its pitch-class set.

5. Common-tone transfer

   Move from C major to any correct F-major voicing and inspect movement efficiency separately.