Jazz is a music born in the United States and formed by a combination of influences. In its infancy, jazz was a melting pot of military brass bands, work songs and field hollers of the United States slaves during the 19th century, European harmonies and forms, and the rhythms of Africa and the Caribbean. Later, the blues and the influence of Spanish and French Creoles with European classical training nudged jazz further along in its development. As it moved through the swing era of the 1930s,...