Listening to candlelight

I remembered reading once that manufacturers of electric candles had been using melody-card chips as LED drivers, causing these candles unseeingly to emit music. In order to ‘audify’ this optical sounds, I connected a BPW34 diode (with large Silicon cell, so it actually generates a voltage) to a jack chassis and hooked it up to an amplifier. The following youtube clip shows the results. Strange enough in this candle no beautiful (Christmas) melodies, but a strange repetitive crazy synth….