Musical

The following has helped this chart reach its present form.

Interactive circle of fifths, by Rand Scullard

How to use musical modes, by Tom Van Schoor

How to create chord inversions on piano, by jamminwithyou.com

the Ultimate guide to the circle of fifths, by musical-u.com

All the scales, by William Zeitler, and a Study of scales, by Ian Ring, for entities' binary representability

Hexiano, by James Haigh and possible contributors

Technical

Hexiano, by James Haigh and possible contributors

Design overlay, by Manabu Shimobe and possible contributors

Some time ago, i discovered a libre Android app for an isomorphic music keyboard, named 'Hexiano'. I found isomorphic keyboards simpler than the standard music keyboard layout.

I thought to make a graphic on which i would mark basic music theory concepts, so that i could see them as i play on / with the keyboard. I subsequently found a libre Android app named 'Design overlay' which let me do that.