This is the ultimate critical review of the music of Abba on record, on film and on stage. Abba were hugely successful during the seventies and eighties, selling over 400 million records worldwide, and their music is still incredibly influential today, enjoying a massive popular renaissance through the worldwide influence of the stage phenomenon Mamma Mia. Drawing on rare archive footage much of it unavailable on DVD, a leading team of music critics and working musicians revisit and review every Abba album from the pre-Waterloo era through to The Visitors.