Pop quiz: what is the top grossing musical movie of all time worldwide? No, not West Side Story or Chicago or even Grease. The honor goes to Mama Mia, which has raked in James Cameron numbers since its 2008 release. The only possible explanation for this figure, beyond Pierce Brosnan’s unforgettable vocal performance, must be the unstoppable power of Abba. More than three decades after the Swedish quartet relinquished their reign over the world pop charts, their AM-Gold hits simply refuse to fade away. Now, the San Antonio Symphony will do their part to keep Abba alive with the help of the world’s most popular Abba tribute group, Arrival from Sweden. Though tracks like “Dancing Queen” and “Fernando” never lacked for pop bombast, the full symphony treatment should offer a whole new level to the band’s widely adored catalog.