Final answer:
The answer cannot be provided without the context of the story in which the character sings 'This land is your land' during a protest. The subject relates to Arts, focusing on literature or cinema.
Step-by-step explanation:
The question "The character who surprises everyone by singing 'This land is your land' during the protest is?" refers to a specific event within a narrative, most likely from a novel, play, or film. Without the context of which story or piece of media this event is from, providing an accurate answer is not possible. Since it's a question about a character within a story and their actions, the subject pertains to the Arts, more specifically to literature or cinema. To answer properly, one would need to know the source material from which this question arises.