I always find it interesting that there is typically little soul/funk/R&B to be found on these type of threads.
I grew up in the late '60s and '70s, and, while that period was obviously golden for Rock, I found black popular music to be more compelling. So, in that particular vein, I'd take these (and many more, if possible):
Open Our Eyes – Earth Wind and Fire
That's the Way of the World – Earth Wind and Fire
Tower of Power – Tower of Power
Back to Oakland – Tower of Power
Live in New Orleans – Maze, Featuring Frankie Beverly
^ these five if pressed
All Day Music – War
Wild and Peaceful – Kool and the Gang
Flood – Herbie Hancock
City Life / Unfinished Business – The Blackbirds