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: When Bruce got home from school he turned on the radio and sang along. Sentence2: He thought he was alone but his mother was listening in the next room. Sentence3: At the end of the song there was a pause and he heard her cheer. Sentence4: Bruce sang an encore performance for his mother.
The mother was proud of her musical son.