Adding audio output
3.5mm audio port
The Raspberry Pi comes equipped with a 3.5mm audio port. This will allow you to plug most speakers or headphones into the Raspberry Pi, so that you can listen to the output from fantastic programs like Sonic Pi.
With either the Raspberry Pi 3 or a Bluetooth dongle, you can connect to Bluetooth speakers or headphones. Your success rates may vary depending on the dongle and/or speakers you're using, so ensure that you read the manufacturer's documentation.