From left: Jalynn Steele, Jessica Crouch and Carly Sakolove in "Mamma Mia!" at the Ahmanson Theatre (Photo by Joan Marcus) For over 25 years, “Mamma Mia!” has rocked audiences around the world through the driving disco rhythms of ABBA's music, with a story by Catherine Johnson and songs by ABBA alum Benny Anderson and Björn Ulvaeus, plus some by Stig Anderson. Center Theatre Group's current production at the Ahmanson Theatre fully delivers on the raucous spirit of this belove