Name: 4 Sure - Female A Cappella Quartet. Descripton:4 Sure is an award winning Female Quartet. These 4 Mom's love singing wicked awesome Harmony! Whether you love Oldies, Barbershop, or hits from today, one thing is for sure, this A Capella group is sure to hit a "chord" you will love. Offering entertainment for Parties, Weddings, National Anthem performances, Singing Telegrams and more!