Marilyn McCoo was one of the few women to have a #1 charting song in 1976 (if memory serves, could be 75)—but held the position longest, at 4 weeks. PURELY FYI. These are the things you learn researching Linda Ronstadt.
Florence LaRue and Marilyn McCoo of The Fifth Dimension, circa 1970. Photo: Terry O’Neill/Hulton Archive/Getty Images.