Organ comes from the Greek word ‘organon’ which means ‘instrument or tool’.Ctesilus of Alexandria is credited with the invention of the hydraulic. By the 8th century, it had assumed a prominent place in the liturgy of the catholic church. In the organ music before 1650, Antonio de cabezon, Jan Pieterszoon Sweelinck & Girolamo Frescobaldi were the three prominent composers. The North German School rose to prominence with Buxtehude and J.S.Bach