Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent overview of 1930s Ellington

Duke Ellington was a genius, and these two compact discs show how his musical style was developing in the 1930s. Highlights include "Carnival in Caroline" and a swinging version of "Ol' Man River". While perhaps not as groundbreaking as some of Ellington's later work, he still brings his unique style and talents to the material.