Yes, that's true. But the most notorious jam bands are bands like the allman brothers, The Dead, Phish and Widespread Panic To name a few. All of which are bands whose style cover multiple genres, but I would still say that they're primarily rock bands, but I guess that's arguable. They're multi-genre bands, I suppose, which is a big reason why they're so notorious as jam bands.
I agree that bands from any genre can be jam bands, but how many jazz bands are so commonly associated with the word "jam band" as The Dead or Allman Brothers? None that I can think of.
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