Answer:
Minimus represents the producers of state-approved songs and slogans in Stalin's era.
Step-by-step explanation:
George Orwell's "Animal Farm" is an allegorical take on the dictatorial government of the Soviet Union. Using animal characters as the main protagonists, the author presents the state of authority that befalls any 'government' that works to overcome one another, and the futile result that only leads back to the original condition.
In the given passage from the novel, the animals were seen singing "Beasts of England" which is a rebellious song that inspires them to be united and have a sense of brotherhood. But when Squealer came to announce the prohibition of the song and instead introduced a new song composed by the poet Minimus. This new song didn't seem to have the same effect of unity and patriotism as "Beast of England" does. But being ordered to sing only the new song, the animals on the farm have no choice.
This 'forceful' introduction and implementation of the new song to replace the old, familiar song can be seen as a representation of the state-approved songs and slogans under the rule of Stalin (or in the case of the story, Napoleon) through puppet producers such as Minimus.