Help with writing

[JazzBassoon]

Hello.
I was commissioned by my band director (after arranging http://www.mediafire.com/?mwjtj2nthzy, an arrangement of "Saturn, The Bringer Of Old Age" from "The Planets") to write a four movement symphony. "We need more music," he says. So, I get to the Scherzo (3rd Movement) and get completely stuck. Any help with writing Scherzos in particular? (I can never write them. They always turn out terribly dark and heavy.)
http://www.mediafire.com/?yyztn4nnzmm< There it is. Very beginning of Scherzo there.

[Brassman388]

I could help.  I'll check out what you have so far.

[JazzBassoon]

Thanks.

[The-Real-Link]

A Scherzo means literally: A Musical Joke.
I Scherzo should be playful and light. Not to mean it can't polyphonically heavy. Might I suggest listening to John Williams's "Scherzo for Motorcycle and Orchestra" from Indiana Jones and the Last Crusade. It is a perfect example of what I'm talking about. "Out to Sea" from Jaws is another of his pieces that has a Scherzo feel to it.