There is a quote somewhere from A&S that said that when they originally presented the idea of recording AIN'T NO MOUNTAIN HIGH ENOUGH to Diana, she didn't want to as she had already recorded it before [[with the Tempts). When they assured her that it was a completely different interpretation, she got on board. She might have felt the same about KEEP AN EYE. It's almost like they had run out of material and needed something else.
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