I found the score for free from Neue Mozart Ausgabe.com. I'm working on learning orchestration, and I figured the best way would be to use Mozart's work to begin with, and then progress through the romantics to the 20th century. This took a long time and is incomplete. There was a snag in the program, and Muse Score shut down after I had completed about 30 more measures. I lost all of them, even though I clicked on "Save" throughout. Is this typical?