There have long been many misconceptions about White Plains, the British harmony-pop group most famous for “My Baby Loves Lovin’.”  Foremost among those misconceptions: White Plains wasn’t a real band. (Truth: It was, despite its unorthodox origins, and had four consistent members between 1970 and 1974.)  Another one: White Plains was a one-hit wonder. (Truth: the group scored five U.K. hits and a pair in the U.S., too.) White Plains was a vehicle for the ubiquitous voice of session singer Tony Burrows. (Truth: Burrows’ participation was limited to the group’s earliest recordings.) …