Organists have found it necessary to make special study of these new instruments, and the University of the State of New York has thought the matter of sufficient importance to justify it in chartering the "Hope-Jones Unit Orchestra School" as an educational institution. Our review would be incomplete without some mention of AUTOMATIC PLAYERS. When one listens to the Welte-Mignon Piano Player, it seems difficult to believe that a skilled artist is not at the keyboard performing the music. The exact instant of striking each note and the duration during which the key is held are faithfuly recorded and reproduced with absolute accuracy, and a pretty close approximation to the power of blow with which each key is struck is obtained. The first of these, that is, the time and duration of the note, is directly recorded from the artist who plays the piece to be reproduced. The second of these, that is, the power of tone, is subsequently added to the record either by the artist himself or by musicians who have carefully studied his manner of playing. The result of this is a very faithful reproduction of the original performance. In the case of the organ, the pressure with which the keys are struck does not need to be recorded or reproduced, but instead of this, we have to operate the various stops or registers and the various swell shades if we would obtain a faithful reproduction mechanically of the piece of music played by an artist on the organ. Automatic Players are attached to many pipe organs. They, for the most part, consist of ordinary piano players so arranged that they operate the keys, or the mechanism attached to the keys, of an organ. This is a very poor plan, and the resulting effect is thoroughly mechanical and unsatisfactory. Only one keyboard is played upon at a time as a rule, and neither the stops nor the pedals, nor the expression levers are operated at all. The Aeolian Company, of New York, effected an improvement some years ago when they introduced what they term the double tracker bar. In this case, the holes in the tracker bar are made smaller than usual and they are staggered--or arranged in two rows. Every evenly numbered hole is kept on the lower row, and the oddly numbered holes are raised up to form a second row. Provided the paper be tracked very accurately, and be given careful attention, this plan adopted by the Aeolian Company allows of two manuals of an organ being played automatically; but still the stops and expression levers are left to be operated by hand. More recently a plan has been brought out by Hope-Jones that provides for the simultaneous performance of music upon two manuals and upon the pedals--each quite independent of the other. It also provides for the operation of all the stops individually in a large organ, and for the operation of the expression levers.