Hey how can you say that John Williams is just copying?
You can find that kind of obvious examples only in Star Wars Episode IV (the first ever made)... why?
Because when George Lucas asked John Williams to make the score, he gave him these pieces of music (King's Row, Mars etc) and asked him to just play these ones without making anything new.
John Williams rearranged them and made something new out of these pieces. George Lucas liked it, so they kept this new score.
But then, other Star Wars episodes are made with 99% John Williams music...
And even if sometimes, when Williams like something he made he uses it a few times in other scores, he's one of the actual composers that create something new very often.
Hans Zimmer & cie always repeat themselves, like Danny Elfman for example, even Alan Silvestri (I really love his work) repeats himself...
But not John Williams. If you listen to Star Wars, then Jurassic Park, then Far & Away for example... you'll see that it's original pieces, and they don't look like each others.
(ok I just had to give these details about the Star Wars composition because it was out of place to define this as 'copying' : he was asked to^^)
