The heroes of the 1990s jam bands were primarily the grateful dead and:

The correct answer is The Allman Brothers Band

The Allman Brothers Band and the Grateful dead were the two most famous jam bands because of what they did in their concerts. Jam bands would perform lengthy improvisational sections in their concerts which were called jams and they wouldn't just stick to a known set list and play everything in the same manner.

Ithink the answer is d but don’t answer it. i need points.

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