I ham rarely challenged where I walk away from a paying gig. An exception was one of the largest private commissions offered to me in the 1990's. $30k to write an opera score - and it was something of a reversal of what we are talking about.
A "librettist" rewrote Shakespeare's story of Anthony and Cleopatra as Will's version was "all wrong." Red flag #1. The libretto was about 250 tightly spaced pages with the opening line (I'll NEVER forget that!) repeated several times over and over:
"We are the Roman soldiers, marching off to victory!
We are the Roman soldiers, marching off to victory!
We are the Roman soldiers, marching off to victory!
Watch as we do battle!"
Red flag #2. But $30k in 1994 dollars was a lot of money. He offered me $5k to start but I insisted on $30k and no less and he was convinced I was the guy to write it. So about a month passed and he called and said he raised $20 and would get the rest. So we met again. This time I started to talk music (which he actually knew
something about). I mentioned that Samuel Barber had written a beautiful score for an opera with a libretto by Franco Zeffirelli that was performed at the Met in 1966. I knew the score thru my work with Martha Graham as she had choreographed a few arias sung by Leontyne Price
http://www.youtube.com/watch?v=L0LywmN5DaE
These are no small players by any means and my comment was that while I could write a score for his libretto, the "competition" was pretty stiff and that I doubt I could do anything even close to what Barber did. Certainly not any better. His response?
"Oh that! I know the Barber score; it's a disaster!"
End of discussion. "Then I'm the wrong guy. See ya!"
So to answer your question a little more directly, I tend to NOT delineate music into styles. Certainly they exist, but it's only notes, sounds and rhythms and that is what we do. There is certainly a "feel" to different types of music, but it gets down to technique. Some people spend their lives in one genre and stay there. In fact, most do. But my training such as it is, is in theater, and that means you're writing for a 60's musical one week, a 1890's mellodrama the next and for Chinese Opera the following. Add to that a dance background where your writing for toy guns one day, prepared piano the next (maybe later that afternoon) and a 35 piece ensemble the next - followed by a work for piano 4 hands.
It's all about versatility as far as I am concerned, and Hollywood HATES that. They want to pigeon hole you into a style. "You're the guy who does silent films" I hear so often. Clearly that's not the case in my mind. Sure, I write for silents, but I also write for theater, dance, animation, film, TV, mime, radio and concert music and still write love songs on my guitar every so often. If they can't get over it, then I'd certainly look for other collaborators. Then again, if they need a score for a hula movie, then I'm your man.
ps- I apologize in advance if this is coming off as an egotistical rant. I don't know any impersonal way to talk about my views of music creation. I suspect that's why many don't broach the subject at all. What the heck?