A pipe organ is a musical instrument that produces sound by forcing air through pipes. Each pipe corresponds to a specific note, and the organist plays it using a keyboard. The instrument can vary in size, from small home organs to large ones found in cathedrals and concert halls. Pipe organs are often associated with classical music and are commonly used in religious settings, such as churches and cathedrals. They can create a wide range of sounds, from soft and gentle to powerful and majestic, making them unique among musical instruments.