The crossword solution for the term 'Mama of Pop' is CASS. Cass Elliot, also known as Mama Cass, was an American singer and member of the 1960s folk rock group The Mamas & the Papas. She was known for her powerful contralto vocals and her solo hits such as 'Dream a Little Dream of Me'. She was also a successful solo artist, releasing five solo albums during her career. Her influence on pop music has been widely recognized and she is remembered as one of the most iconic female singers of the 1960s.