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

They always say that the two people I most regret never seeing

live are :

Cab Calloway

and 

Rocky Erickson 

Cab was playing what very well might have been his last concert in NYC but my girlfriend at the time didn't want to see anything that wasn't classical. 
and I don't think Rocky ever came to NYC while I was living there. 
I wish I had seen:

Al Jolson

The Happiness Boys

Alberta Hunter

Sophie Tucker

Sonny Boy Williamson 

Big Mama Thornton 

Hank Williams

The Maddox Brothers and Rose

The Clash

The Jam 

The New York Dolls

The Feelies

I wish I had seen The Cramps and the Ramones more. 
 

But let's be honest, I can't really remember any of the great concerts I saw… For obvious reasons, and the ones I remember were not so great.  

While I've seen Steely Dan multiple times, I sure wish I could've seen the 2018 tour with Larry Carlton as Walter Becker's replacement.

Sly and the Family Stone

The Doors

Janis Joplin

But I did see:

Gram Parsons*

Bruce Springsteen*

Tim Buckley**

Jimi Hendrix**

Jefferson Airplane (many times)

Cesora Evora

Astor Piazzola

Gypsy Kings

Philip Glass (Einstein on the Beach, at Lincoln Center)

and a number of others

* at Max’s Kansas City

** at The Filmore East

@misterspooky - I saw the New York Dolls, I think at the Santa Monica Civic. They were awful. All posing. No talent to speak of. I actually sold my New York Dolls record soon after seeing them. I later saw David Johansen solo. Yeah he was actually good. I still enjoy his only(?) elpee.