Who sings: Move On; When All Is Said And Done; The Day Before You Came; Cassandra; I'm A Marionette; ...?

Question

They started in 1974 and stopped in 1982. I am talking about a European group that sold over 400 billion records all over the world. A group loved by Madonna, Nicole Kidman, Australian nation, Nelson Madela, Bono Vox, Paul McCartney, John Lennon, Elvis Costelo, etc. This group received a proposal of 2 billion dollars to return but it was refused by all members of the group. This group is called by the criticals as a legend. The group is known specially because of the harmony between the two principal voices, the power of the two voices. This group has reached uncountable number of gold and platinum records.
What's the name of the group?

Answer 1

If you know all of this information about them, then why don't you know that name?

Anyways the group is ABBA .... and i Love them!

Answer 2

ABBA?