5. Mamma Mia!

'Mamma Mia!' is the juebox musical that uses the songs of ABBA to tell the story of a bride-to-be searching to find out who her father is. At the time, the 2008 film adaptation - which starred Meryl Streep (centre) alongside Amanda Seyfried - grossed $609.9 million, becoming the highest-grossing movie musical ever at that time.