Jazz, the __(1)__ of the American Negro, first became recognizable as a separate __(2)__ of music towards the end of the 19th century in New Orleans, a city in the __(3)__ of the United States of America. About 1910 dance musicians began using jazz phrases and today most __(4)__ music includes many such phrases. During the last ten years jazz has enjoyed a tremendous revival of __(5)__ . The instruments used were trumpets, clarinet, guitar, and drums. In the early days the piano was added and then saxophones and later still other __(6)__ were introduced into jazz bands. The fundamentals of jazz are: (a) an instrumental style based on the imitation of the human __(7)__ ; (b) a melodic style where major and minor keys are often undetermined; (c) a rhythm which has its __(8)__ in Africa; (d) improvisation, where each musician varies the melody from performance to performance.