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: Madison had a song stuck in her head. Sentence2: All day she found herself humming the tune. Sentence3: She couldn't remember what it was, though. Sentence4: She looked up the lyrics.
Finally she found the song.