ABBA's Björn Ulvaeus is proving that curiosity doesn't diminish with age. At 80, the Swedish songwriter behind some of pop music's most enduring hits is pioneering a new frontier in musical theater: ...

The Swedish pop savants ruled 1970s radio, invaders coming from the land of the ice and snow to become the top-selling act of their time. Björn Ulvaeus, Benny Andersson, Agnetha Fältskog and Anni-Frid ...

And it’s not just ABBA. It might be Bon Jovi (“Livin’ on a Prayer”) or Survivor (“Eye of the Tiger”) or Journey (“Don’t Stop ...