Anni-Frid Lyngstad—more commonly known as Frida from the gazillion-selling international super-group ABBA—caught a performance of
Mamma Mia! at the Winter Garden Theatre on April 24. Based on the ABBA songbook, the musical is now well into its seventh year on Broadway, and it still inspires audiences to sing along with evergreen hits like "Dancing Queen," Take A Chance on Me," "Knowing Me, Knowing You" and "Super Trouper" night after night. After the performance, the cast had an audience of one with the woman who helped start it all. Hail, Frida!