Music theory practice, chord progressions, keys and scales

Music theory practice, chord progressions, keys and scales: A music production college I worked at in London a while back asked me to teach a Music Theory and Music Composition course with chord progressions, keys & scales. I know my way around a fretboard of a guitar and used to play in jazz bands before I discovered turntables, so I thought I give it a whirl! I looked on the internet for ages for good simple rules for chords, scales and extended chords but couldn’t find anything that I thought would be easy for the students to...