I always show my piano students the mechanism inside the piano - and sometimes we have a bit of fun with it all. This is the first video we made. It's called "How Pianos Work - Chicken Theory" and it's aimed at students aged 4-8 years. Perhaps your students might enjoy watching or making their own!

http://www.youtube.com/watch?v=TOf4av2NVqs&feature=related
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www.youtube.com/user/yardpiano1?feature=mhee
Piano teacher since 1987
Victorian Music Teachers' Association member