God is the Creator of variety and diversity. There's nothing boring or monolithic about his creation. It's full of surprises. In Creation he brings order out of chaos. That is exactly what the artistic-creative impulse is.
Good music is full of surprises.
A great musical artist knows how to achieve that goal. God is neither. Sacred music should expand the soul and fill it with grace and insight and the delight of discovery. Nothing crosses boundaries and melts walls quite as powerfully as music. It's our most powerful tool of communication, rightly used.