Who will be the next big “jam band?”

I use the term loosely. Not necessarily only jam band specific e.g. Gov’t Mule

Grateful Dead
Allman Brothers
Phish
Widespread Panic
Gov’t Mule

Those are five of the big ones. I also include bands like Umphrey’s McGee, moe., SCI, etc.

This is about disliking a band or writing pejorative posts about a band. Simply what up and coming band(it has it yet to be formed) is able to sell out Red Rocks, but maybe still playing smaller venues in other cities. The Grateful Dead always come first for me, but all artists I’ve included are immensely talented. So who is it? I’m generally late to the party when it comes to a current, new band making good music because I’m usually on a kick of a couple of bands above.

I’ve heard Twiddle and liked them a lot.