The program is available to use for free at:
String theory is a a browser based music theory and practice tool that can solve which chords are possible from various scales and then output the information onto a fret board or piano for study or practice. You can think of it as an interactive scale and chord reference, or musical slide ruler. This is version two of the tutorial as we’ve made a lot of changes to it since the first video.
This video gives an explanation of how the software works. It’s a bit long, so here are the time stamps of the most relevant parts:
01:30 How the program works
06:13 Use the scale, mode and key selector
07:25 Use the chord, note buttons and other controls
11:30 change instruments to guitar
14:54 How to play a scale from guitar view
16:28 How the program deals with modes
18:05 Chords from more exotic scales
19:20 Speed training metronome overview
21:02 Jam in A harmonic minor
Please share this with anyone you think may find it useful. We encourage music teachers to use this as a tool in classrooms or private lessons. And also feel free to give us feedback about what you’d like to see changed in the interface, or other possible additions that might be useful. Let us know with a direct message. We will keep this program online and free to use, and plan on updating it periodically.