The Hammond organ, named after its inventor Laurens Hammond, debuted in 1935 as a cost-effective electro-acoustic alternative to the gigantic pipe organs mainly installed in churches. Among Hammond’s first customers were George Gershwin and Count Basie. Jazz pianists like Basie, Fats Waller, Wild Bill Davis and Milt Buckner were the founding fathers of the instrument’s international conquest, which led across all styles of popular music, from jazz to progressive rock, with its heyday in the 1960s and '70s.