Hell, at my age, I can't remember all the bands, musicians, performers I have seen. But here are a few I remember...
Beatles,
Stones, 5 times,
Jimmy Hendrix,
The Doors,
Mountain,
The Allman Brothers, with and without Dwayne,
Crosby, Stills, and Nash, with and without Neil Young. 4 times
Jerry Jeff Walker, 4 times
Leo Kottke,
Arlo Guthrie,
Jimmy Buffet 10 times,
Yes,
Pink Floyd, 4 times,
Styx, 3 times,
ZZ top, 2 times
Alice Cooper, 3 times,
REO Speedwagon,
Jethro Tull,
Fleetwood Mac, 4 times,
Richie Havens,
Joni Mitchel, 2 times,
Carol King, 2 times,
James Taylor,
Billy Joel, before he made it big.
Eagles, 4 times,
Linda Ronstadt
Leon Russel,
Sly Stone,
Eric Clapton, 2 times, once as Derrick and the Domino's,
Ozzie Osbourne, 2 times without BS
Black Sabbath, 1 time with Ozzie
Iron Butterfly,
Hall & Oats,
Steely Dan, 3 times.
Bob Seeger, 3 times.
Tom Petty and the Heartbreaks, 2 times,
Elton John, 2 times.
Emerson, Lake, and Palmer,
Electric Light Orchestra,
War,
Santana,
Crazy Horse, with and without Neil Young.
U2, 2 times
Bob Marley, 2 times
Joan Jet,
Emmylou Harris, Numerous times,
The Band,
Bob Dylan, 2 times,
Dr. Hook,
Van Morrison,
Country Joe 'Gimmie and F' McDonald,
Van Halen, with and without Dave... 2 times
Guns and Roses, Once was enough...
The Black Crows,
10CC,
Blue Oyster Cult,
Aerosmith, 4 times,
The Marshal Tucker Band,
The Dave Matthews Band,
Bad Company, 2 times
Steve Miller, 2 times
Lynyrd Skynyrd, 5 times, twice before the big bird crashed.
Bruce Springsteen, 2 times.
Jeff Beck,
Beach Boys, 5+ times, lost count...
Monkeys,
Jefferson Airplane & later as Jefferson Starship...
The Grateful Dead, 3 times
A Beautiful Day,
Spirit,
AC/DC,
Kansas,
Chicago,
Johnny and Edgar Winters,
Green Day, 2 times
David Bowie, 3 times
Mr Peter, Do you feel, like I do? Frampton 2 times
Joe Walsh,
Peter Gabriel,
Redbone,
Willie Nelson, many times
Waylon Jennings,
Garth Brooks,
Alan Jackson,
Shaina Twain, 2 times
Garth Brooks, 2 times
Travis Tritt,
Marty Robbins,
Johnny Cash,
I have also been to numerous Blue Grass and Jazz Festivals and can't remember all the groups/performers I have heard.