Given the task definition and input, reply with output. In this task, you're given a four sentences of story written in natural language. Your job is to complete end part of the story by predicting appropriate last sentence which is coherent with the given sentences.

Sentence1: John decided to form a band. Sentence2: He asked all his friends if they wanted to join his band. Sentence3: A few wanted to join but did not know how to play instruments. Sentence4: John taught his friends how to play.
Now they have a successful band.