"What a Wonderful World" is a ballad written by Bob Thiele and George David Weiss, which was premiered by, American trumpeter and singer, Louis Armstrong and first released as a single in the early fall of 1967. Intended as an antidote to the political and racial climate of the 1960s, it was written especially for Louis Armstrong, who gave it special appeal with a raspy, soothing voice.
https://www.deviantart.com/mattmotane/art/Louis-Armstrong-564990698
The song describes the singer's delight in the simple everyday things, and maintains an optimistic tone with hope for the future, including a reference to babies being born into the world who will have much to see and grow up with. It was not initially a hit in the United States, where it sold less than 1,000 copies, but it did achieve greater reception in the United Kingdom, reaching the top sales spot in 1968.
The song's worldwide diffusion began with its inclusion in 1987 in the soundtrack of the movie "Good Morning, Vietnam", directed by Barry Levinson.
https://www.deviantart.com/dragonfirejlk/art/Louis-Armstrong-81700275
Armstrong reshaped ragtime music by making it more relaxed, and thus cemented the foundations of jazz. He was able to hold tones in an unusual way, which added heroism or drama to his interpretations.