OK, a little bubblegum: This '70 Tony Romeo composition was released the same day as the TV debut of "The Partridge Family", being played twice during the 1st season. It topped the charts two months later. Only David Cassidy and his real-life stepmother Shirley Jones participated in the recording - the rest were studio musicians. The "group" had 6 more Top 40 hits between '70 and '74.
Yesterday's answer: "Black Betty" by Ram Jam. http://www.youtube.com/watch?v=lMLnDuzgkjo