Hammond organ
The Hammond organ is a keyboard instrument that looks like a piano. The most common Hammond organs create sound using metal wheels and electricity. It is an electric version of a pipe organ that was invented by Laurens Hammond and John M. Hanert. It was first built in 1935. Sliding "drawbars" adjust the type of sound that the organ makes. The Hammond organ is one of the most successful organs made because almost two million Hammond organs were sold.