What artists or works from past 10-20s are absolute must-knows for everyone?

What artists or works are your favorite?

Who or what work is criminally underappreciated?

Who's up and coming?

Who might I like based on the following list of some of my favorites:

Dizzy Gillespie (my #1 all time favorite)
Duke Ellington
Charles Mingus
Dorothy Ashby
Ahmad Jamal
Art Farmer
Elvin Jones
Max Roach
JJ Johnson
Thelonious Monk
McCoy Tyner
Sarah Vaughan
Shirley Scott
Errol Garner
Chick Corea
Louis Armstrong (of course, really that whole early New Orleans thing)

Why am I even listing all these ppl.. Kinda pointless lol