Gramophone record
A gramophone record is a flat disk that is usually made of plastic. The sound is recorded on a very fine line or groove which goes around and around in a spiral from the outside edge of the disk to the center. The phonograph plays the sound with a needle that touches the groove. A record usually has different music on each side. When made of vinyl they were also known as vinyl records. Most music made in the 20th century used this format.