I was thinking about DoD's Jazz Month from a few years back, and I remembered how we were joking about all the different kinds of jazz, like funeral jazz and whatever we could come up with. Anyway, this came to mind: metal jazz.
Invisible Oranges did an article recently showcasing bands who are jazz metal. There's some really good stuff there.
By the way, I'd certainly not classify Animals as Leaders as jazz metal.
To me, Diablo Swing Orchestra is ska metal, not jazz metal.