The Hammond B3 organ is an electric organ that became popular in the 1960s and 1970s, especially in jazz, rock, and gospel music. It features a distinctive sound created by spinning tonewheels and a unique drawbar system that allows musicians to customize their sound. The B3 is known for its rich, warm tones and the ability to produce a wide range of effects, including vibrato and percussion. Many famous musicians, such as Jimmy Smith and Jon Lord, have used the B3, solidifying its place in music history as an iconic instrument.