The "King of Ragtime" in Black history is Scott Joplin, a highly influential African American composer and pianist who is widely regarded as the most important figure in the development of ragtime music. Ragtime is a genre of music characterized by its syncopated rhythms and lively melodies, and it was extremely popular in the United States in the late 19th and early 20th centuries.

Scott Joplin was born in Texas in 1868, and he began studying music at a young age. He went on to compose numerous ragtime pieces, including his most famous composition, "Maple Leaf Rag," which was published in 1899 and became a huge hit. Joplin's music combined elements of European classical music with African American musical traditions, creating a unique and distinctive sound that captivated audiences.

In addition to his compositions, Joplin also played an important role in popularizing ragtime music and helping to establish it as a recognized genre. He sought to elevate ragtime from its origins in bars and saloons to the concert stage, and he was one of the first African American composers to achieve widespread success and recognition for his music.

Scott Joplin's legacy as the "King of Ragtime" lives on today, with his compositions still being performed and cherished by musicians and audiences around the world. He played a crucial role in shaping the development of American music and his contributions to the genre of ragtime continue to be celebrated and admired.