The videos below cover musical theory and feature the multi-touch instrument called Lattice developed by Appttic.
Episode 1: A New Musical Instrument | video
Episode 2: Musical Scales | video
Episode 3: Pentatonic and Diatonic Scales | video
Episode 4: Intervals | video
Episode 5: Consonance and Dissonance | video
Episode 6: Chords | video
Episode 7: Jingle Example | video
Episode 8: Diatonic Minor Example | video