Someone just pointed out to me that Django was recorded electronically, and the "Gypsy Jazz" sound was not traditional in any way--it was a product of the recording studio.

I thought about it, and realized that even though we make a big fuss about the solo work, a big part of the genius of those recordings was the use of multiple guitars to create that driving rhythm--drums didn't record well in those days, but by pointing a microphone at a couple guitars and bring them up in the mix, it created a really big sound that didn't occur in nature.