The scope of music as an educational diversion will expand in proportion to the training, patience and energy of the music aide. It will be limited by the number of patients who demonstrate an interest and also upon their intelligence and perseverance. For the major instruments, instruction is usually individual and much time is consumed in the diversion of a single patient. In a large hospital this will not be very practical unless there is a large staff, and there are many activities available to patients. Group diversion can be happily attained by some form of instruction in music appreciation. The nature of this instruction should be tailored to the intelligence and taste of the majority and the music aide must exercise common sense and free himself of prejudice. If the patients are young and uninterested in the classics he must devise a program around popular music and discuss current personalities and popular forms. A driving wedge into the classics may be constructed on the classic themes of Tschaikowsky, Chopin and others which are currently popular. If the group is very young, music appreciation demonstrations such as those conducted by Walter Damrosch should be followed. Whenever possible, the musician should illustrate with “live” music, but recordings will be well received. As with all other features of a musical program in the hospital, sessions should be regular and governed to some extent by the will of the majority. _CHAPTER NINE_ PUBLIC ADDRESS SYSTEM Many hospitals now have public address systems. Before long most hospitals of one hundred or more beds will have public address systems, if for no other reason than emergency calls and to lessen the load on the intramural telephone network. The public address system originally installed as an emergency call device may be used for music reproduction at relatively little increase in expense. The same operator may be used for both forms of transmission. Ideally, the system should include a loud speaker in every ward and a “phone-jack” at every bedside. The central switchboard should have a good radio and an automatic record player which may transmit music to the patients by means of the public address systems. The addition of a set of switches which can cut wards in or out at will can prove most useful. If there are halls or buildings from which programs of general interest emanate frequently, they should be equipped with microphones which are connected with the central switchboard so that musical programs from the assembly hall or the church services from the chapel may be broadcast to the non-ambulatory patients.