The term 'Dance Done in Single File' refers to the CONGA, a Cuban dance that is traditionally performed in a single-file line. The CONGA is a lively, rhythmic dance that originated in Cuba and is now popular around the world. It is usually performed with a group of people, each holding onto the waist of the person in front of them, and dancing in a line. The CONGA is often accompanied by Latin music and is a great way to get people up and moving.