Mamma Mia! Plot Summary: Set on a colorful Greek island, the plot serves as a background for a wealth of great ABBA songs which are used in remarkably appropriate ways. A young woman about to be married discovers that any one of three men could be her father. She invites all three to the wedding without telling her mother, Donna, who was once the lead singer of Donna and the Dynamos. In the meantime, Donna has invited her backup singers, Rosie and Tanya.