The term 'Cathedral Organ Features' refers to the components of a pipe organ, which is a type of musical instrument that produces sound by forcing air through pipes. The most common feature of a pipe organ is its pipes, which are made of metal, wood, or other materials and come in various sizes and shapes. The pipes are arranged in ranks and controlled by a keyboard, allowing the organist to play a variety of notes and sounds. Other features of a pipe organ include stops, which are knobs that control the flow of air to the pipes, and couplers, which allow the organist to combine different ranks of pipes.