"C Jam Blues" is a jazz standard composed in 1942 by Duke Ellington and performed by countless other musicians, such as Dave Grusin and Django Reinhardt. As the title suggests, the piece follows a twelve-bar blues form in the key of C major. The piece typically features several improvised solos. The final solo continues in the upper register as the entire ensemble comes in and the music grows to a climax. The melody likely originated from the clarinetist Barney Bigard in 1941, but its origin is not perfectly clear.