The 50 Musicians I would have loved to have seen live, but never did (w/certain exceptions). In order

Jimi Hendrix

Sex Pistols

The Doors

The Clash (1976-1982)

Charlie Parker

Nirvana

John Coltrane (the later the better)

James Brown

Roxy Music (w/Eno)

Yardbirds

Minutemen

Black Flag

Elvis Presley

Velvet Underground

Beatles (the later the better)

Billie Holiday

Led Zeppelin

Frank Zappa

Joy Division

Muddy Waters

Fugazi

Thelonious Monk

The Jam

Cream

The Stooges

Temptations 

Lightning Hopkins

Howlin' Wolf

Kiss

Chuck Berry

MC5

Grateful Dead (1960s - 1970s)

PIL (early)

Stray Cats

David Bowie (1970s)

Grace Jones (1970s)

Dead Kennedys

Bob Marley

The Smiths

Miles Davis

Charles Mingus

Diana Ross & the Supremes

Sly & The Family Stone

Amy Winehouse

Run-DMC

The Band

Eric Dolphy

New York Dolls

Stevie Ray Vaughan

Can

Butthole Surfers