Dave's Conservatory: Learn about music for free!
A series of short videos (70 at last count) that address difference aspects of music, such as:
Part 1 - What is Music?
Part 3 - Beat and Pulse
Part 5 - Rhythm
Part 1 - Getting Started
Part 4 - The Bass Clef
Part 1 - David and Katy ask "What is music for?"
Part 3 - How has technology shaped the development of music? (Part 2)