Rrrring, rrrring, rrrring. It's a telephone made from string.
http://pbskids.org/zoom/activities/sci/stringtelephone.html
Be a sound scientist with the Super Sounding Drum.
http://pbskids.org/zoom/activities/sci/supersoundingdrums.html
The purpose of this experiment was to determine if a sound barrier does reduce noise, and which type of barrier is the most effective in reducing highway traffic noise.
http://www.selah.k12.wa.us/SOAR/SciProj2000/StevenP.html
This animated site illustrates and explains the Doppler effect.
http://www.fearofphysics.com/Sound/doppler.html
Share some secret sound with a friend by your handmade phone.
http://www.exploratorium.edu/science_explorer/ear_guitar.html
You hear sounds when vibrations get inside your ears and stimulate your nerves to send electrical signals to your brain.
http://www.exploratorium.edu/science_explorer/secret_bells.html