The Power Fifth Sound
One step of a perfect 5th — and 4 near misses, each a single tone away.
The chord-quality drill loads here.
Built upward, the power fifth is one step of a perfect 5th — 2 tones in all. In a drill it arrives in a key you did not choose, so the only thing left to listen to is that shape.
Near missesmajor triad, minor triad, sus2 and sus4 — each one is this chord with a single tone moved, which is why a wrong answer here is almost never random.
It sits in the colour tier — one tone moved off a triad you already know.