Spectra. Click on "Doppler Shift" for great animation on how this works. http://www.valdosta.edu/~cbarnbau/astro_demos/frameset_seasons.html
How Your Brain Understands What Your Ear Hears! Web Portion of Student Activities Great interactive animations of parts of the ear and how sounds pass through the parts of the ear. http://science.education.nih.gov/supplements/nih3/hearing/default.htm
Farm Machine Music http://www.snopes.com/photos/arts/musicmachine.asp
Atomfilms - Pipedream (Animusic) http://origin.www.atomfilms.com/film/animusic_pipedream.jsp
Doppler Sound - 30 mph car horn (download - iTunes Science Playlist) http://nsdl.exploratorium.edu/nsdl/showRecord.do;jsessionid=354D3A053DC9BF3109D4F0684951258A?id=1210&qid=SAQ-2&itemsPerPage=10&index=0
"teenbuzz" ringtone http://download.npr.org/anon.npr-mp3/atc/atc_teenbuzz.mp3
Visual Patterns & Sound (you create) http://potatoland.com/p-soup/
NASA Doppler Interactive Demonstrations http://www.grc.nasa.gov/WWW/K-12/airplane/sndwave.html
NPR download teen ringtone sound effects
http://www.ilovewavs.com/Effects/Animals/Animals.htm
Find Sounds http://www.findsounds.com/types.html
Bird Songs http://www.naturesongs.com/birds.html
mosquito ringtone different frequencies http://www.freemosquitoringtones.org/