Is there a copyright lawyer in the house?

I’m one of those rare people who thought Napster had it coming. I don’t believe in copying albums you haven’t bought, much for the same reason I would resent it if people xeroxed my books and didn’t pay me for them. But a question occurred to me today. What about fair use? I have a nice Duke Ellington album I found at the library with a great performance of “Take the A Train” on it (it’s “Ellington at Newport” for you afficianados). There are lots of other great tunes on there, but the main one I want is “A Train”. So is it an exercise of “fair use” to copy one tune off a double album? Or is it just rationalization for theft? Talk straight to me. I wanna know.