Here are two videos that do a good job of describing how sound is produced.
Sound Waves and their Sources (1933) http://www.youtube.com/watch?v=cK2-6cgqgYA&list=UUucupwTXUP0IaKzafA-WmvA...
Pitch Systems in Tonal Music Part 2: The Octave and Just Intervals http://www.youtube.com/watch?v=3ZL5evNWD2M&feature=BFa&list=PLB322565F6E...
The low monthly subscription of $16.95 gives you full access! We accept major credit cards and PayPal.
Subscribe
After watching the BluesHarmonica.com overview video, try one of the lessons below to experience a lesson at BluesHarmonica.com.