What are the main parts of a pipe organ?

Conventional pipe organs are complex instruments composed of four primary parts:1

• Keyboard and controls: This includes the manuals (keyboards played by the hands) and the pedalboard (played by the feet), which allow the organist to control the instrument.1
• Pipes: These are the components that produce the tone. They are organized into sets called stops or registers and fall into two main categories: flue pipes and reed pipes.21
• Wind supply: A device, typically bellows activated mechanically or electrically, provides the pressurized air necessary to produce sound.1
• Mechanism: This system connects the keys to the pipes. When a key is pressed, it opens a pallet (valve), allowing pressurized air to travel through a channel and into the corresponding pipe.1

These components work together to create the organ's sound, with the stop mechanism acting as a gatekeeper that determines which ranks of pipes will speak when the keys are played.31