The immune system includes certain types of white blood cells. It also includes chemicals and proteins in the blood, such as antibodies, complement proteins, and interferon. Some of these directly attack foreign substances in the body, and others work together to help the immune system cells.
Scott Joplin. Scott Joplin was the best-known American ragtime musician and composer, setting the standard for all that followed. Ragtime â which gave birth to Jazz â has a rhythm in which the accompaniment is strict two-four time and the melody, with improvised embellishment, is in steady syncopation. Joplin`s instrument of choice was the piano. Early days
Joplin moved to St. Louis in 1901, where he continued to compose and publish music, and regularly performed in the St. Louis community. The score to his first opera A Guest of Honor was confiscated in 1903 with his belongings because of a non-payment of bills, and is now considered lost.uring his brief career, he wrote 44 original ragtime pieces, one ragtime ballet, and two operas. One of his first pieces, the  Maple Leaf Rag , became ragtime's first and most influential hit, and has been recognized as the archetypal rag.