Steve Schwartz writes regarding Shapero's Symphony for Classical Orchestra:

>In the last movement, Shapero makes his intent plain with an unmistakable
>shard of Beethoven's Seventh, which he nevertheless integrates into the
>movement itself - a surprise, but not a surprise.  Suddenly, the previous
>movements come into sharp focus, and you marvel at how something so
>original owes so much to its predecessor.

Something very similar is done by Sir Michael Tippett in his Third
Symphony with its use of Beethoven's Ninth.

 - seb