50s:
Hank Williams
Chuck Berry
60s:
Motown (Barry Gordy I guess)
The Beatles
70s:
Beegees
James Brown and/or Diana Ross?
80s:
Prince
Michael Jackson
George Strait
90s:
Death Row Records
Garth Brooks
00s:
Outkast
Kanye
10s:
Beyonce (I am not super into her but she deserves it)
Kanye
Jason Isbell/Father John Misty (hipster dad tour)
(I don't like him but I'm surprised Drake hasn't been on any list).
quite a few could//should span multiple decades: Kanye, Bey, Aretha, Motown, James Brown, Diana Ross (as a supreme), Outkast