Several of the symphony orchestras across the country have great, interactive websites for children, parents, and teachers. I just came across the Nashville Symphony Orchestra Kids website the other day. The Our Instruments section of the site has a photo and brief info about each instrument, along with a short recording so that students can hear what that instrument sounds like. I especially like the instrument section under the Resources for Parents and Teachers. You can download a pdf file with the info about each instrument and distribute it to students. This would be great as a stand-alone info sheet, or as an inclusion in a workbook for students about the instruments of the orchestra.