Mamma Mia! is a stage musical written by British playwright Catherine Johnson, based on the songs of ABBA, composed by Benny Andersson and Björn Ulvaeus, former members of the band [Wiki]. I had the chance to watch it few years back when I went to visit a friend in London and I would gladly watch it again. ABBA is one of my favorite all-time bands.
Spotted at the Salon Du Livre Francophone 2012 yesterday.