OK, @The_Monkey, I guess I cheated here by adding a latch. I needed it to play a xylophone with a motor.
The circuit shown is power + long led + light sensor (dark) + number + wire + latch + DC motor. I could have just used a buzzer instead of the latch and DC motor.
@The_Monkey, can you try testing an idea of yours? Post a short video of it here. We can turn it into a more official project after we've tested a few ideas.