organ

The pipe organ is the largest and one of the most complex musical instruments ever built. It produces sound by sending pressurized air through pipes of different sizes, shapes, and materials. A large church organ may have thousands of pipes controlled by multiple keyboards (manuals) and a pedalboard played by the feet. The organ has been associated with church worship for over a millennium. Bach's organ works represent the pinnacle of the instrument's repertoire, and the toccatas, fugues, and chorale preludes he wrote in Weimar and Leipzig remain the core of every organist's repertoire. Modern electronic organs simulate the sound of pipes, making the organ accessible outside churches and concert halls.