Paragraph- Sent 1: One day Magneson took a walk in the park.
Sent  2: He passed some trees and a pond.
Sent  3: In the pond was a duck named George.
Sent  4: George's wife was also in the pond.
Sent  5: Her name was Nancy.
Sent  6: Magneson walked over to the tree.
Sent  7: Nancy flew up into the tree.
Sent  8: She wanted to warn Magneson about the killer squirrel who lived inside of the tree.
Sent  9: A few years before, the squirrel had thrown a chestnut at George and Nancy's son.
Sent  10: He was knocked out, and the squirrel took him away.
Sent  11: He was never seen again.
Sent  12: Magneson asked what their son's name was.
Sent  13: They said it was Leonard.
Sent  14: But Magneson was only making small talk.
Sent  15: He didn't believe the story about the killer squirrel.
Sent  16: Even if there was one, there were many rocks by the pond that he could throw at the squirrel.
Sent  17: He could also hide in the tall grass.
Sent  18: George and Nancy were sorry to see that Magneson wouldn't listen.
Sent  19: They flew away, singing a sad song.
Sent  20: A short time later, the squirrel came out of the tree and threw a giant walnut at Magneson.
Sent  21: No one ever saw Magneson again.? 
Question: Upon making the realization Magneson would not listen to reason, what kind of song did George and Nancy sing as they left the scene?
No.