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

Wow, I had almost forgotten what a nice thread looks like with like minded people.

For some reason I got old jazz guitar slingers on my mind.

Django Reinhardt

Charlie Christian

Eddie Lang

Jim Hall

Barney Kessel

Bill Frisell

Tal Farlow

Herb Ellis

Freddie & Grant Green 

Charlie Byrd

Kenny Burrell

Genesis on The Lamb Lies Down on Broadway tour (Gabriel's final tour with the band). My best friend got sick, so I missed the show.

Renaissance and Spirit. I missed the show because I got sick. 

Badfinger on my 18th birthday, had to be 21 to get in. State lowered the drinking age to 18 the next year....a year too late for me.

J S Bach

Chopin

The Who (but my hearing thanks me. For a while they were loudest band in the world)

Pink Floyd

Talking Heads mentioned a lot here, but I did see them during their 'Stop Making Sense' tour, and David Byrne has to be the most entertaining front man I ever saw.

Also saw the original King Crimson line-up in 1971, another terrific show.