Live music is quite different from the visual arts. For example, every time a musician plays a given song, it is unique, with inevitable variations from one performance to the next. As Joni Mitchell once noted, no one ever asked Van Gogh to paint <I>The Starry Night</I> again. But many musicians are expected to play certain songs at every concert, and these songs sound different every time. On the other hand, recorded music is more like a painting—once it's in the can, it sounds exactly the same every time it's played.