Why not? And it might only cost you a few thousand dollars.
A doctor in Illinois commissioned a mass from Christopher Rouse. A Twin Cities musical version of the Beardstown Ladies stock club gets together after dinner to talk about movies and family life and which oboe concerto we should commission next.
Read here for more information, including a booklet of commissioning instructions and a phone number for assistance. The bottom line: Patronage today is more active, and more decentralized, than ever before.