At your risk. Take safety precautions. Any voltage or current can be dangerous. A fuse must be used in series with any battery for fire hazard protection. Protect your hearing.
http://www.theorycircuit.com/simple-single-transistor-audio-amplifier-circuit/
Includes an electret mic connecting circuit.
Great it is going well.
Soon so many people on our planet would start to be listening to music.
Datasheet of BC547:
https://www.sparkfun.com/datasheets/Components/BC546.pdf
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