Don Leslie was an American inventor and musician, best known for creating the Leslie speaker, a unique device that enhances the sound of electric organs, particularly the Hammond organ. The Leslie speaker uses rotating speakers to produce a rich, swirling sound that has become iconic in various music genres, especially in jazz and rock. Born in 1917, Leslie's innovation transformed the way musicians approached sound. His invention gained popularity in the mid-20th century and is still widely used today. The Leslie speaker has influenced many artists and remains a staple in modern music production, showcasing Leslie's lasting impact on the music industry.