TASK DEFINITION: Given a sentence, generate a most likely context or previous statement. The previous statement should be relevant to the given statement.
PROBLEM: He puts it in his pocket.

SOLUTION: Someone steps inside the vault and snatches up the package.

PROBLEM: Someone taps the bar, then removes his goggles and shakes his head.

SOLUTION: He pauses, and they hover over his head.

PROBLEM: people are gathered around the piano watching the people sitting on the piano.

SOLUTION:
A man and a woman are sitting in front of a piano playing it together.