The piano (or pianoforte to give it its proper name) is a musical instrument with a keyboard. A normal piano has 88 keys. Pianos use the keys to move hammers that hit strings inside, making a sound. Pianos come in two basic shapes: grand pianos and upright pianos. The piano has been an extremely popular instrument in Westernclassical music since the late 18th century. A person who plays the piano is called a pianist.
In music, the organ (from Greek ὄργανον organon, "organ, instrument, tool")is a keyboard instrument of one or more divisions, each played with its own keyboard, played either with the hands or with the feet. The organ is a relatively old musical instrument, dating from the time of Ctesibius of Alexandria, who is credited with inventing the water organ. It was played throughout the Greek and Roman world, particularly during races and games. During the early medieval period it spread from the Byzantine Empire, where it continued to be used in secular and imperial court music, to Western Europe, where it gradually assumed a prominent place in the liturgy of theCatholic Church. Subsequently it re-emerged as a secular and recitalinstrument.