Gary D Lloyd: Chopin's Music Box 

I woke up with a beautiful theme in my head. Unfortunately, about 30 seconds later, when I was more awake, I realized that I didn't write it. It was the main theme of Chopin's E minor Piano Cocerto, the second movement.
But unfortunately the music that Chopin wrote it is way too hard for my students. So I thought about making this theme into a music box melody. I changed the key from E major to G major. Then I changed the time signature from 4/4 to 3/4, a gentle waltz.
• Chopin: Piano Concerto...
And that is the link to what Chopin actually wrote.