Final answer:
The most unique national anthem is the national anthem of South Africa, which combines two different songs and is sung in five languages, representing the diverse culture and history of the country.
Step-by-step explanation:
The most unique national anthem is the national anthem of South Africa. It combines two different songs and is sung in five languages, representing the diverse culture and history of the country.
The anthem also begins in one melodic key and ends in another, adding to its uniqueness. It has received international recognition and awards, such as The Economist's Best National Anthem in the World award in 2017.
South Africa's national anthem perfectly reflects the country's transformation and spirit of togetherness.