Great for encores!

Suppose the great American jazz composer Duke Ellington and classical music giant Beethoven meet in heaven. They would find they have a lot in common. Both epitomize their musical time, place, and culture. Both are powerful pianists widely admired for their improvisational abilities. They decide to collaborate. Beethoven insists on creating the introduction and a cadenza (the point near the end of concertos where the featured musician tries to squeeze in as many notes as possible into a small amount of time). Ellington agrees to handle the main theme allowing room for improvisation along the way. Together, they hammer out a piece sadly destined only for celestial ears unless some mortal can be found to perform it for earthlings. I'm the lucky one they choose. This is the result.