It's from an old 1939 movie called, 'They shall have music', so there is some of the movie in this clip, but it's the best one I could find on youtube.... Well, of course because Heifetz is performing it. *worship*
http://youtube.com/watch?v=ZRHlZho5xm8 Anyway, the clip is kind of long. But if you've got nothing else to do, its awesome!
His form is so perfect... *fan girl sigh*