Music Box series -Mamma Mia! The Musical, for variable wind quintet (with percussion ad lib). On April 6 1999, exactly 25 years after ABBA had won the Eurovision Song Contest with the song Waterloo, the musical Mamma Mia! opened in London, & soon became a great success. Arranger Peter Kleine Schaars has selected 3 well-known titles from this musical: Mamma Mia, Knowing Me Knowing You & Money Money Money, added Waterloo & applied his musical imagination to produce this medley.