Sly and the Family Stone, “Hot Fun in the Summertime”, 1969
The original. This was blasting from everyone’s AM radios in 1969, in the car, on portable radios, it was part of the fabric of popular culture.
There are no words good enough to describe this incredible band. Simply in a league by themselves.
Here’s a live version from some TV show, and it’s an actual performance, not lip-synced, believe it or not.
For comparison, a version by Hall and Oates live in concert from 1985 - still good, not as great as the original: