"C Jam Blues" (1942) is performed by Duke Ellington and a collection of other Jazz giants in a famous recording called "Jam Session". A jam session is impromptu performance characterized by improvisation. Consequently the song, built on 12-bar blues, was written as a vehicle for jazz instrumentalists to display their improvisational skills. Barney Biggard is likely the author of the actual melody. Artists included Duke Ellington, piano; Rex Stuart, trumpet; Ben Webster, tenor sax; Joe Nanton, tr