In our electronics lab at school there's some interesting stuff...
- Wave generator (can so squarewave/sinewave, has a knob for frequency)
- wave sweep generator (squarewave/sawtooth-wave/sinewave, all sorts of buttons and knobs on it)
- various other stuff
- I could probably round up some old electromechanical relays if I tried
I bet I could play music with that stuff if I really tried... What do you think?