Tonic finding

A 4-bar chord progression plays in a random major key. When it ends, play the tonic on the keyboard — any octave counts. The progression deliberately doesn't end on the I chord, so you can't shortcut by naming the last root.

• Wrong taps shake; the answer reveals after three.
• Replay anytime — replays don't count against you.
• Mic input works too — play the note on your real instrument.

Trains tonic finding — the foundational act of tonal hearing, the one that underpins every other ear-training skill.