One progression, three parent scales, the shared tones lit
Music’s Abacus & Slide Rule
Every scale, chord and mode in one two-octave frame — organized by interval instead of notation, so the relationships are identifiable, not esoteric.
Open the Matrix → Free to access, no account necessary New to it? Read the guide first →
One progression, three parent scales, the shared tones lit
32 parent scales, 180 modes — every mode of every scale, with its triad, 7th and extensions wherever the mode has them. The free Matrix opens with no account and no email, and covers the four scale families most players live in.
The same notes shown three ways at once, always in step with each other. Read whichever one you actually think in.
Enter a progression and every chord comes back with its parent scale. Stack them up and watch the common tones resolve across the changes.
I’m Jeff, a self-taught guitarist and teacher in Franklin, Massachusetts. I built the Matrix because nothing I could find showed the whole picture at once.
That’s how I teach, too: the connections, in the order you actually run into them. If theory still feels like a pile of unconnected rules, that’s the gap I teach into.
Lessons & services →Open the Matrix → Free to access, no account necessary Or start with the guide →