Biography: ABBA is considered possibly one of the greatest vocal groups of all time.

Björn Ulvaeus, Benny Andersson, Agnetha Fältskog, and Anni-Frid Lyngstad "officially" came together in the spring of 1969 when Björn and Benny met the two women who were to become not only their fiancées but also the other half of ABBA when they were all called in to sing on a musical television programme - the rest is music history.