"The Girls' Night Out" was a public performance by an all-female a cappella choir called "The Lennox Headliners" based on the Far North Coast of NSW. The Headliners are part of an international organisation called "Sweet Adelines" of which there are nearly 1200 members in Australia alone. The group sing four-part harmonies in the barbershop style with an emphasis on showman(?)ship and choreography.