The Andantes

The Andantes were a prolific female sessions group for the Motown record label during the 1960s. Composed of Jackie Hicks, Marlene Barrow, and Louvain Demps, the group sang background vocals on numerous Motown recordings, including songs by Martha Reeves & the Vandellas, The Temptations, Stevie Wonder, the Four Tops, Jimmy Ruffin, Edwin Starr, The Supremes, The Marvelettes, Marvin Gaye, among others. Barrow also substituted for Florence Ballard of The Supremes in concert on several occasions.

source: Wikipedia