The Winner Takes It All: The Abba Story reflects the peaks and valleys of the Swedish supergroup's popularity over the decades, as well as the quartet's turbulent years together. The documentary successfully manages to piece together both the group's public and private sides through the use of interview excerpts and video footage, and it also contains exclusive interviews with all four members of Abba for the first time since their split. Reflecting on the intricate nature of their music, as well as the elevation of their compositions to the heady heights of pop classics, the documentary concludes with behind-the-scenes footage of preparations for the Abba-inspired stage show Mamma Mia! This is a must for all Abba fans, as well as those wishing to discover the heritage of one of the world's greatest pop groups. --John Galilee