Throughout Sweeney Todd the plot is consistent. There are two main storylines (Todd and his revenge and Anthony and Johanna) that propel the action. Both storylines are easily to follow, making the flow of the piece stable. This stability provides a sense of continuity to Sweeney Todd. Sondheim communicates through Sweeney Todd with his use of leitmotifs and dialogue. He uses leitmotifs to communicate the relationship between the beggar woman, Johanna and Todd, although it may not be obvious. In