Barry's Scale Reminder

Dr. Barry Harris says a chord comes from a scale. This is a tiny tool that shows the possibility of the scales from any chord.
The main purpose of this tool was for major 6 - diminished scales, and minor 6 - diminished scales, but 7th - diminished scales, 7th (b5) - diminished scales, and combination of two diminished scales were added later.
His workshop is held not only in New York, but in Europe and Japan.
You can get the schedule and information from his official site:
BarryHarris.com