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This simple circuit can provide hours of enjoyment as you learn tunes, play duets or just make some really weird sounds by pushing all the buttons at once. You have probably seen this ciruit before, it is fairly common. I have seen it in several books. The best thing about the circuit is that you can tune each individual note, or go to a whole new octive by changing one capacitor (C1). Because of this, it is possible to from an entire Transistor Organ ensemble.

R1-R88250K Trim Or Regular Pot R9, R122100 Ohm 1/4 W Resistor R10110K 1/4 W Resistor R111220 Ohm 1/4 W Resistor R1315K Pot C110.01uF Capacitor C210.1uF Capacitor Q112N4891 Unijunction Transistor Q212N2222 Transistor2N3904 S1-S88SPST Switch SPKR18 Ohm 2 W Speaker MISC1Wire, Circuit Board, Knobs For Pots