Swedish pop group Abba took the world by storm in the 1970s, and their music still resonates with fans worldwide. This documentary portrait includes insightful interviews with the four band members, plus rarely seen footage of them from before Abba was formed. Also featured are more than 20 of the band's biggest hits, including "Dancing Queen," "One of Us," "Mamma Mia," "Take a Chance on Me" and "Fernando."