About a year ago, I remember reading a post on alt.fan.frankzappa where some guy accused Danny Elfman of ripping off Frank Zappa. For some reason I started thinking about that today, and it upset me. Why is it that when Frank Zappa lifted entire sections from Duke Ellington, Eric Dolphy, or Igor Stravinsky it was called a "tribute" or "paying homage," but when Danny Elfman does the same, it's called "ripping off"?