Bands/artists you never got to see live in their heyday, but would've liked to.

John Coltrane
Miles Davis
Jimi Hendrix
Joni Mitchell
The Band
The Grateful Dead
The Doors
Creedence Clearwater Revival
Traffic
Cream
The Velvet Underground
Bob Marley and the Wailers
The Who (with Keith Moon) - saw them twice in the early 80’s but it wasn’t the same
Roxy Music
Howlin’ Wolf
Nina Simone
Sly and the Family Stone

+1 for the Beatles, Yardbirds, Talking Heads

I left the Beatles off my initial list because of the screaming and mayhem.  I just spaced on the Yardbirds and Talking Heads. I saw David Byrne perform solo in the 90s where he donned a huge boxy suit similar to the one he wore in "Stop Making Sense" except it was Pepto Bismol pink!