ABBA were never known as a live act. In fact in their hey day, they were accused of being a hit machine. This nowadays is rejected, the ins and outs of each ABBA song is now well documented to have been a very complicated derivation of a song from its early stages to its completed form.
ABBA In Concert is ABBA at their best, recently released on DVD the show flows through their gruelling US tour. A small insight into the group's day to day lives is included, but mainly the music is concentrated on.
I recently watched Madonna's Confessions on the Dancefloor Show on TV, now also out on DVD, this show by Madonna had undertaken many hours of editing, overdubbing and to be frank was a fraud. She did not sound anything like this in reality, she was taken into the studio and redid many of the vocals.
This in ABBA's In Concert DVD is evidently not done, the group is shown performing live as live was intended, with absolutely no overdubs and a true live sound. The difference between a Madonna "live" concert and an ABBA Live concert is massive, Madonna defrauded the viewer, ABBA played it live as true professionals, and I respect ABBA for having shown the world that they were TRUE artists and not frauds like many of the stars of today with all their fake voice enhancements.
Long live ABBA, they will be remembered for far longer than a Madonna or anything produced in today's throw away music world.