History of the Laurens Hammond and Don Leslie
Lesson time: (2min 18sec)
Joe Glossop tells the story of the Hammond organ and the Leslie speaker, from Laurens Hammond's tone-wheel generator to Don Leslie's rotating cabinet.
Course preview
This lesson is part of the course Authentic Hammond Language for Rock and R&B
Watch a preview of the full course below.
Lesson transcript:
The Story of the Hammond Organ
The Hammond organ was invented by a French watchmaker named Laurence Hammond. He had a variety of inventions and projects underway, and he came up with the idea of creating a mechanical tone wheel generator. This generator could produce tones using:
- Little cogs with spacers
- Spinning through an electric current
- Generating sound along the way
Essentially, he created the first synthesizer. In the 1930s, Hammond intended for his organs to be standalone units.
The Innovation of Don Leslie
Then entered Don Leslie, who loved the organ sound but desired more movement and intriguing possibilities. He invented a speaker featuring:
- A rotating horn
- A rotating bass speaker
This allowed the organ to be played with added dynamism. Over the years, Hammond and Leslie had many disagreements, as Laurence Hammond was hesitant to let Don use his speakers with the Hammond organ. He kept changing the inputs and outputs, making it difficult for Leslie to use them. Ultimately, the two eventually became friends, but it took considerable time.
My Hammond Organ
I found my Hammond on eBay, which is quite standard for these instruments. It's a 1963 (possibly 1962) C3 with red caps inside instead of white caps. The:
- White caps are an older type of capacitor with slightly different components.
My Hammond is a workhorse organ. It's not a beautiful studio piece; in fact, it's chopped in half for easier transportation. There's a line where it separates, allowing for the top half to be lifted off.
This design makes it somewhat portable instead of weighing an absolute ton. It's been in and out of more vans than I can remember, so it genuinely does its job well.
While there are organs that sound smoother and silkier, this isn't one of them. This is a true touring workhorse organ.
About the instructor

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




