Leslie speakers are a type of audio equipment used primarily with electric organs and synthesizers. They create a unique sound by using a rotating speaker system, which produces a rich, swirling effect. This design enhances the audio experience, making it popular in various music genres, especially in jazz and rock. The speaker consists of two main components: a stationary horn and a rotating drum. As sound travels through the horn, the drum spins, creating a Doppler effect that adds depth and movement to the sound. Leslie speakers are often associated with the Hammond organ, a classic instrument in many musical styles.