Galla-Rini tutorial on some uncommon scale modes used in improvisation (1989)

You may have heard of the "Whole-tone" scale because of the great French impressionist composer Claude Debussy, but I've never heard of the "Diminished 7th Chord" scale. It's quite tricky to play on a stradella accordion but the great musical pedagogue offers an easy step-by-step approach to learning it. At his age he was struggling a bit with his reading ability but his accordion technique is still amazing.