Electric organ invented by Laurens Hammond in 1934 and the last electromechanical Hammond organ came off the assembly line in the mid-1970s. The original Hammond organ used additive synthesis of waveforms from harmonic series made by mechanical tonewheels which rotate in front of electromagnetic pickups / originally sold to churches as a lower-cost alternative to the wind-driven pipe organ, in the 1960s and 1970s, it became a standard keyboard instrument for jazz, blues, rock music and gospel music.
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