[sdiy] Synthesizer for childs?

[Byron G. Jacquot]

>I want to build some very easy synthesizer for my childs, 3-7 yrs old. Is
>somewhere on the net some cheap and easy project?

Maybe a little optical theremin, that uses LDRs instead of antennas?  There
are several schematics around the web.  Here's one example:
http://www.maxiespages.com/theremin/optical-thereminBW.gif

A web search would being several others.

Byron Jacquot