We had an AMAZING 8th grade science academy this last Friday and we were able to get some great resources for the Energy unit.  Check them out:
The Science of Acoustics
Acoustics Outreach from BYU
A great video showing a shockwave from a volcano
Acoustic Laser from Penn State
NPR article about a freezer that uses sound energy
How to make a Ruben's Tube
Hypersonic Speakers- Directional sound that works like a flashlight
Summer Physics Research Opportunity for teachers with BYU
What is a Rijke Tube?