Music effectively tied all four main characters together despite all their differences. Trudy, Harumi, Cassie and Esther had very different musical backgrounds, yet they came together to form a punk band. Each one of the girls had something to bring to the table, which also led to a lot of conflict. I think that is one thing I particularly appreciated. They didn’t always get along, which added a facet of realness that I often find lacking in books.