The film begin with the backstage of a concert and you can see that people necessary but invisible. Later come the stars, the players and the director. All of them are workers, all of them are making art. Here you realize that when Whistler said ART HAPPENS, it's only part of the tuth, art is work, it doesn't just happen.
It's not a bonus track, finally you can enjoy a magnificent Mehta's version of the Ravel's classic.
From time to time is hard to agree with the Academy, but in this case, when Bolero won the Oscar, there's no reason to disagree.