Next month, a new musical begins previews on Broadway with the unlikely title of Shuffle Along, or the Making of the Musical Sensation of 1921, and All That Followed. The show chronicles the backstage drama behind the musical Shuffle Along as it broke new ground for African-Americans both on and offstage. The composer was Eubie Blake (1887-1983), whose infectious jazz and ragtime melodies would captivate listeners throughout the whole of the 20th century and make him a popular guest with the