Because the were being persecuted, and they believed that it was Zion.
Scott Joplin was a very popular and successful Ragtime songwriter in the 1800s. He was known as the "King of Ragtime" and composed 44 Ragtime pieces, as well as two ballets, and a Ragtime ballet. The other three artists were popular musicians in the 1950s and 1960s and did not record in the Ragtime era or style.
Barack Obama was the 44th President of the United States.
