What is the importance of the narrator in blood brothers?

... What is the importance of the narrator in Blood Brothers? One of the most compulsory characters in Willy Russell's 1983 play Blood Brothers is the narrator. He is the main dramatic device and is critical for the audience. He makes the plot constantly flow and explains loose ends throughout the story. As well as being the narrator he plays various minor roles. He sings many songs, which show characters' emotions, and introduce and develop important themes. The narrator's main focus is to explain the story and what's happening. After long sections of speech he will briefly explain what's just happened, in case the actions don't make it clear. He also makes sure you fully understand the story. One example is just after Mickey shoots someone. The gun goes off and straight after the narrator says, "There's a man lies bleeding on a garage floor." This explains someone has just

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