It has to be able to play at the maximum expression and communication in every style and the only way you can do that is - like Verdi said - working with a file every day little by little until the orchestra's collective qualities emerge.
I remember when I was 11 I told my mom 'One day I'm going to buy you a house.' And she said 'Boy don't you be making promises you can't keep.' I was like: 'No Ma it's not a promise. I'm going to buy you a house one day.'
