#4: “Hot Fun in the Summertime” – Sly and the Family Stone (1969)
Sly Stone recorded “Hot Fun in the Summertime” one month before the group took the stage at Woodstock. The smooth blend of vocals came from a band that treated harmonies like a family conversation.

provided by constative.com
It played on AM radio all season and lingered in the charts even after the leaves started to fall.
