Who knew Abba had such strict principles when it came to cashing in on the reunion craze? Lead songwriter Bjorn Ulvaeus told the Sunday Telegraph:

We will never appear on stage again. There is simply no motivation to re-group. Money is not a factor and we would like people to remember us as we were - young, exuberant, full of energy and ambition.

And then to hammer the point home:

I remember Robert Plant saying Led Zeppelin were a cover band now because they cover all their own stuff. I think that hit the nail on the head.