But, in addition to his Symphony No. 9, which includes the "Ode to Joy," there is evidence that he began work on a tenth. Unfortunately, when the German composer died in 1827, he only left sketches and notes for the piece. It's possible that he changed his mind before he finished it, or that someone else may have completed it after his death. The main problem with this theory is that none of the sketches or notes include instructions for how the music should be arranged. This means that we can't be sure what kind of finale Beethoven had in mind when he made these sketches. Also, despite the fact that he died before he could finish it, people continue to add new movements to Beethoven's ninth symphony. For example, Gustav Mahler added a final movement to his version of the work. In conclusion, it is safe to say that Beethoven did not finish his tenth symphony but it is possible that he started it.