Is Andrew Lloyd Webber a Plagiarist

I look at some pieces that sound very similar to ones already composed. It is quite a controversy because the Dutch composer Louis Andriessen had some harsh words: “There are two sorts of stealing (in music) - taking something and doing nothing with it, or going to work on what you’ve stolen. The first is plagiarism. Andrew Lloyd Webber has yet to think up a single note; in fact, the poor guy’s never invented one note by himself. That’s rather poor“ Furthermore, Kit and the Widow wrote a humorous tune calle