Final answer:
The story of Mozart being locked in a room with only a pencil, paper, and a bed is likely an exaggerated tale or myth. Mozart was a recognized child prodigy and exhibited his musical talents publicly from a young age without such extreme tests of his abilities.
Step-by-step explanation:
While this tale is intriguing, it does not align with verifiable historical records, and it is most likely a myth or exaggerated story. Wolfgang Amadeus Mozart was indeed a child prodigy and composed music from a very young age, but there is no substantial evidence that he was locked away to prove his abilities.
The classical music world does sometimes tell stories of the incredible feats of its composers, likely as a way to underscore their talent and the sometimes incredulous reactions of their contemporaries to such youthful genius. These tales, however, should be taken with a grain of salt.