A fascinating insight from Benny and Björn into the creation of many of Abba's most famous songs (those used in the musical), which also provides a chronological history of the group itself. I really liked the way the book was written as a sort-of conversation, in the words of the subjects, with the only editorial commentary contained in the photo captions. The second part of the book covers the creation of MAMMA MIA! the musical, from conception right through to the first discussions of a possible movie. I was expecting this bit to be less interesting, but actually it was a pretty frank and open discussion of what goes on to create a West End show, and then a Broadway show, and then how a musical can be rolled out worldwide. I feel like I've gained quite an insight into both how pop music is/was created and how musicals work. And the fact that I saw MAMMA MIA! in London midway through the book enhanced my enjoyment of both!