PBS
Classics for Kids: Musical Instruments
An A-to-Z directory of all the instruments and tools of the orchestra. Each entry includes a description, a picture, and a sound sample.
Other
Online Mallet Lessons
This site contains numerous tips and suggestions dealing with many facets of playing the vibraphone and marimba. Although much of the information is jazz oriented, some is general enough that it could easily be applied to xylophone and...