I agree with all the harpists that only the conductor can say that only one harp is needed. Not only we need a job but also we need the real music of Tschaikowsky and this 2 harp parts are so different that is makes difference. However I know that often it is hard to angage 2 harpists all the time so I was also performing as a one harpist. I did combined part which was really difficult and in the end of the ballet