The organ is an instrument that dates back to the 3rd century BC. The man credited for this invention is Ctesibius of Alexandria who invented an instrument called hydraulis, which used the wind maintained through the pressure of water to some pipes. The organs are most likely found in churches and are used during services. Its divine tone mimics that of the human voice and creates a beautiful sound that many find pleasant. There are three types of organs: pipeless, electronic, and mechanical organs. Pipeless organs are very similar to accordions and harmonicas. Electronic organs produce electronically produced sounds through speakers. So mechanical organs are usually controlled by pinned barrels or music books. The organ is a keyboard instrument with one or more manuals and usually a pedal board. Manuals are keyboards that you play with your hands, and pedalboards are keyboards that people play with their feet. The sound emission of the organ is continuous and constant as long as a key is held down. It is up to the player to determine how long a key is pressed. One good thing about organs is that the volume of the organ's sound does not depend on how hard you hit the keyboard. A person can gently stroke the keys and it does not affect the volume or note produced by the organ. Pianos, however, are very different. The volume of a piano can be raised and lowered depending on how hard you use to strike the keys. There are many types of organs with different purposes including church organ, concert organ, pipe organs, chamber organs, theater organs, pipe organs, chord organs, electronic organs and more! The pipe organ is the largest musical instrument in size and range. The pipe organ has not been modified much since the 14th century. This is very impressive for an instrument that is over thousands of years old. The organ was considered one of the most