Fats as usual came close and/or surpassed my answer:
A great phone book! e.i. players, writers,engineers, rooms, ect. When you make connections keep those numbers and stay in touch. Make a list of all the great players in your area, and what they're good at. A list of rooms, of rental gear.
When you have a new client, nothing looks better than calling the cats that make you look great.
As in picking a great song? Working up a great arrangement?
Coaxing great perfoemances?
In todays corporate enviorment, I would agree that this has become "unexpected".
Great players , engineers, ect can help create an enviorment that lets the unexpected happen.
Chaos Theory anyone?