Interactive
American Museum of Natural History

Sounds of the Silk Road

6th - 12th
Young explorers may not be able to travel the Silk Road but they can listen to music that was played on instruments of the time and create their own songs with the help of an interesting interactive resource. 
Interactive
New York Times

New York Times: Crossword Puzzle: Musical Instruments

9th - 10th
An interactive and printable crossword puzzle developed by the New York Times Learning Network. The theme of this puzzle is Musical Instruments.
Interactive
Quia

Quia: 2003 Music Review

9th - 10th
Play musical Jeopardy! Test your knowledge of sound, instruments of the orchestra, music elements, music notation, and rhythm. Play this interactive game by yourself, or with a friend!
Interactive
PBS

Pbs Kids: Sid the Science Kid: Sandbox Symphony

Pre-K - 1st
Make an interesting musical composition by choosing from a menu of traditional and nontraditonal instruments.