The Leslie speaker is a specially constructed amplifier/loudspeaker used to create special audio effects using the Doppler effect by rotating the speakers or a sound-directing duct. Named after its inventor, Donald Leslie, it is particularly associated with the Hammond organ but is used with a variety of instruments as well as vocals. The Hammond/Leslie combination has become an element in many genres of music. The Leslie Speaker and the Hammond Organ brands are currently owned by Suzuki Musical Instrument Corporation.
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“The most attractive sentences are, perhaps, not the wisest, but the surest and roundest. They are spoken firmly and conclusively, as if the speaker had a right to know what he says, and if not wise, they have at least been well learned.”
—Henry David Thoreau (1817–1862)