Marilyn McCoo is an American singer, songwriter, and actress best known for her work with the group The 5th Dimension. She is also known for her solo career, which includes the hit single 'One Less Bell to Answer'. Marilyn Mcson is an American singer, songwriter, and actress who has released several albums and singles, including the hit single 'Love Don't Live Here Anymore'. Both Marilyn McCoo and Marilyn Mcson have been successful in their respective careers and are widely recognized as two of the most influential singers of the 20th century.