http://www.carnegiehall.org/article/explore_and_learn/art_online_resources_listening_adventures.html
Fun, interactive site using Britten's "Young Person's Guide to the Orchestra"
http://www.niehs.nih.gov/kids/nametune2.htm
Online, name that tune game featuring Patriotic Songs
http://www.playmusic.org/
http://www.dsokids.com/2001/rooms/DSO_Intro.html
http://dsokids.com/2001/instrumentchart.htm
http://www.playkidsgames.com/games/turtle/
http://www.musictheory.net
http://www.sfskids.org/templates/splash.asp
http://www.menc.org
Curriculum Connections
http://school.discovery.com/lessonplans/programs/soundwaves/
http://www.askeric.org/Virtual/Lessons/Arts/Music/MUS0004.html