A popular
organ, especially in the 1950's and 1960's, commonly used today in many bands. Hammond B3 organs usually have two 61 note keyboards with drawbars, and the B3's are noted for their sweet swells,
vibratos,and a handful of other special effects. Ever wonder what kind of organ they used in that funky tune on the radio? It was probably a B3.
The Leslie tone cabinet, an external speaker, usually accompanies the B3 organ (normal amps don't really work with the B3).
Laurens Hammond, founder of the Hammond organ, was not a musician, apparently. He could not play the organ that he built and he was said to be tone deaf. However, he did have help; during 1930 Laurens hired musicians to help him create the Hammond organ.