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Rh supply each singer in the chorus and each desk in the orchestra with a copy, to see to it that more music is ordered. It is impossible to rehearse efficiently if the singers in a chorus have to use a part of their energy in trying to read music from a book or sheet held by some one else, or if the players in an orchestra are straining their eyes because three or four instead of two are reading from a single desk.

It will be convenient for the conductor to possess a file containing a copy of each number in the library at his home or studio, each copy being marked "conductor's copy." In this way, the director will always be assured of having the same music, and will feel that it is worth while to mark it in such a way as to make it more useful in both rehearsal and performance.

Do not make the mistake of counting or tapping on the desk constantly during the rehearsal. You may think you are strengthening the rhythm, but as a matter of fact, you are actually weakening it, for in this way you take away from the performers the necessity of individual muscular response to the pulse, and at the performance (when you cannot, of course, count or tap) the rhythm is very likely to be flabby and uncertain. Singing with the chorus is another mistake against which the amateur should be warned. The director not only cannot detect errors and make intelligent criticisms if he sings with the chorus, but will make the members dependent upon his voice instead of compelling them to form the habit of watching him. The only exception to this principle is in teaching new music to a choir composed of very poor readers, in which case it is sometimes much easier to teach a difficult phrase by imitation. Even here, however, it is almost as well to have the organ give the correct tones. In leading community singing, the conductor will of