Quote Originally Posted by midnightman View Post
Mary and Flo are on the 45 version lol

The Andantes add background harmonies. Those "ahhhhs" that appear when Diana hits the bridge before the "think it overs" come in are the Andantes. THAT'S what they contributed. It's still Diana, Mary & Florence. The Andantes are just a vocal FOOTNOTE on "Stop!".
The Andantes were used only for "augmentation". Augmentation means -the action or process of making or becoming greater in size or amount.

The producers decided that they wanted more voices on the recorded to create a bigger sound.