I just had to know!, so I Wiki'd it.
The Jazz apples, with which I have become so enamored lately, come from New Zealand like so many other trendy imports. Apparently they are a cross of Gala and Braeburns, also both from NZ, though neither one nearly as remarkable as teh Jazz.
I've been smitten (and they've been bitten) since the shiny skins caught my eye. Hella tasty if you roll that way. (You know, if you get down with fruit.)
In summation, omg, so fucking good.