Any chord, on both instruments at once.
Pick a root and a quality. Step through the playable guitar shapes, and hear each one — every note lights up as it sounds.
Root
Quality
C major
Keyboard
This chord belongs to these keys
Fretboard
What this is actually showing you
Chords are stacked intervals, nothing more
Every chord here is built by counting semitones up from the root. The formula is the chord — the shapes on your instrument are just consequences of where those notes happen to sit.
Same chord, many places
Step through the guitar positions and watch one chord move up the neck. That is why a single shape works in twelve keys.
Major and minor differ by one note
Switch between them on the same root and listen. One semitone is the whole difference.
Chords belong to keys
Most chords sit inside several keys at once. That overlap is what makes changing key possible.
Keep going
The theory underneath
Circle of fifths
Which chords belong to which key, laid out as a wheel you can click.
Open tool →How chords are built
Stacked thirds, four triad types, and why major and minor differ by a single note.
Read →Your first open chords
Four shapes that unlock most songs, and the drill that makes changing between them automatic.
Read →