"Mamma Mia!" The Movie has shown just how popular the songs of Abba really are. As if the estimated 350,000,000 records, tapes and CDs sold since the 1970s were not already testament enough to the Swedish foursome's huge popularity. In 1999 "Mamma Mia!" the stage show opened in London and it has been selling out ever since."Thank You For The Music" looks at the often moving stories behind every song in Abba's superb collection, and includes every song featured in the hit movie.