Earth, Wind & Fire, of course. From this Washington Post reminder:
But if other groups have borrowed from EWF’s brass fanfares, bouncy rhythms and hearty mix of genres, joy remains a singular hallmark. No mainstream group or solo artist embodies that emotion as thoroughly as EWF.
See also "Boogie Wonderland".
Linda Ronstadt, live in Atlanta, 1977.
From the comments: "Back in the days when those with true talent could sit alone in dim lit light and be SPECTACULAR!!! Not much talent today that can pull that off."
10-minute video of a bar chart in motion.
Live and acoustic, Florence and the Machine. (Music starts at two minutes in.)
Gorgeous cover by Bonnie Raitt and Lowell George from 1972. (Song begins about 2:53.)
From the comments: "[Y]ou may think you are cool, but you will never be Bonnie Raitt 1972 cool." Also: "Not fair my parents had this and I got Kanye west."
Jefferson Airplane, live on the Dick Cavett Show.
The Allman Brothers Band, live at Fillmore East, 1971.
After reading this I still don't know. But I'm a bit relieved that I'm not the only person who doesn't know.
Jefferson Airplane, of course--you were expecting maybe the Monkees?--live at Woodstock.
Music by Third = Party.