This is a very simple NE555 based electronic kit for electronics beginners. It is a basic piano kit. I have written a similar project article before on this website. You can see it here. The kit has been built in an astable multivibrator mode. Every press of the switches results in a change in resistance in the astable multivibrator mode circuit.
The schematic of the kit:
See all the images below to get an idea for assembling the kit. You can see the images on Flickr also.