The Leslie speaker is a specially constructed amplifier/loudspeaker used to create special audio effects using the Doppler effect. Named after its inventor, Donald Leslie, it is particularly associated with the Hammond organ. The Hammond/Leslie combination is now a ubiquitous element in many genres of music ranging from 1960s organ trio hard bop to the growling, distorted tones of early 1970s acid rock. Currently both the Leslie Speakers and the Hammond Organ are owned by Suzuki Musical Instrument Corporation.

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