The Three Degrees

The Three Degrees are an American female vocal group, formed in 1963 in Philadelphia, Pennsylvania. The group has always been a trio, although there have been a number of personnel changes and a total of fifteen women have represented the group so far. The original members were Fayette Pinkney, Shirley Porter and Linda Turner. The most successful line-up was Fayette with Sheila Ferguson and Valerie Holiday, these three being responsible for recording the 1974 single "When Will I See You Again", which was a huge international hit, peaking at #2 in the US and topping the UK Singles Chart.

source: Wikipedia