ABBA's Bjorn Ulvaeus marks 50 years since Eurovision win

ABBA's Bjorn Ulvaeus reflected on the Swedish pop group's reach and longevity as he joined the cast and creators of "Mamma Mia!" the musical on stage at the end of a special 25th anniversary performance in London on Saturday (April 6) evening, and the 50th anniversary since winning the Eurovision Song Contest final.