The term 'Half of a 1960s Folk-Rock Group' refers to the two members of the folk-rock duo Simon & Garfunkel. The crossword solutions for this term are 'PAPAS' and 'MAMAS', which are the surnames of the two members, Paul Simon and Art Garfunkel. Paul Simon and Art Garfunkel were an American folk-rock duo who rose to fame in the 1960s with hits such as 'The Sound of Silence' and 'Mrs. Robinson'. They are considered one of the most successful musical duos of all time.