The Hammond B-3 organ is an electric organ that became popular in the 1960s and 1970s, especially in jazz, rock, and gospel music. It features a unique sound produced by spinning tonewheels and has a distinctive warm, rich tone. The B-3 is known for its drawbars, which allow musicians to customize the organ's sound by adjusting the volume of different harmonics. The B-3 organ is often played with a rotating speaker called a Leslie speaker, which adds a swirling effect to the sound. Many famous musicians, including Jimmy Smith and Jon Lord, have used the B-3, solidifying its place in music history.