This song was written and performed by Lord Kitchener in 1957 to celebrate Ghana getting their independence from Great Britain after years of war, slavery and trade. It tells a short version of the Ghanaian independence story, a description of the flag and even the congratulations from another African ruler.
The use of music as a way to tell stories is a feature of many different genres from all over the world. Listen to Lord Kitcheners vocal style. It's almost like he's casually telling a story to friends and family rather than trying to deliver a serious vocal performance.