Were any members of ABBA in mamma mia?

Well, honey, ABBA is the whole reason "Mamma Mia" exists! The musical and movie are based on the songs of ABBA, but none of the original members of the band actually appear in the production. So, while you won't see Agnetha, Björn, Benny, or Anni-Frid on stage, their music sure steals the show.