Louis Armstrong was a seminal figure in the jazz genre, known for his distinctive gravelly voice and virtuosic trumpet playing. He was a key player in the development of jazz into a fine art, with his improvisational style and innovative techniques widely influencing future generations of musicians. Armstrong's most notable works include "What a Wonderful World" and "Hello, Dolly!", both of which showcase his unique vocal and instrumental style. His contributions to music have solidified his place as one of the most significant artists in American history.