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Lesson time: (2min 18sec)
Joe Glossop tells the story of the Hammond organ and the Leslie speaker - how Laurens Hammond's tonewheel generator and Don Leslie's rotating horn created the classic sound.
This lesson is part of the course Authentic Hammond Language for Soul & Jazz
Watch a preview of the full course below.
Lesson transcript:
The Hammond was invented by a French watchmaker named Laurence Hammond. He had all sorts of inventions and projects on the go, and eventually came up with the idea of creating a mechanical tone wheel generator. This generator could produce tones via small cogs with spacers in them. As they spin through an electric current, they create a tone along the generator.
He essentially created the first synthesizer back then. In the 30s, Hammond intended for these organs to be standalone instruments. However, another innovator named Don Leslie loved the organ sound but wanted more movement and interesting possibilities.
Don Leslie devised a speaker with a rotating horn and a rotating bass speaker that could be used to play the organ through. Over the years, Laurence Hammond and Don Leslie had many disputes because Hammond didn't want Leslie to use his speakers with the Hammond organs.
Eventually, they became friends, but it took a significant amount of time.
I found my Hammond on eBay, which is pretty standard, isn't it? It's a '63, possibly '62 C3, with red caps inside it rather than white caps. The white caps are an older type of capacitor with slightly different components.
My Hammond has been in and out of more vans than you'd care to remember, so it really does the job. There are other organs that sound far smoother, more silky, and newer, but this isn't one of them. This is a true touring workhorse organ.

Joe Glossop is a keyboard player from Sheffield who has made his name on the Hammond organ. He currently holds the organ chair in Tom Jones's touring band, and has played with Van Morrison and James Hunter, as well as on piano and Rhodes. His courses get the real Hammond sound out of any keyboard - drawbar registration, the Leslie, the walking-bass left hand, and the comping and soloing vocabulary of the soul-jazz, blues and rock organ traditions, from Jimmy Smith to Booker T. read more