I found this list and my dream one day is to visit most of these music festivals! Last year we discovered the Green River Festival and it was awesome. Other festivals that I have been to and loved: Newport Folk Festival, Mountain Jam, Up North Festival, Kahbang Festival, Pemi Blue Grass Festival . . . .I am sure there are some I don't remember but these were good times!
https://www.festicket.com/magazine/discover/top-festivals-usa/