Community sings should not last too long. The music aide will soon learn to sense the capacity of the audience. To extend the period, patient participation may be interrupted by instrumental music or some other form of interlude. CHOIR Listening to a combination of trained voices is pleasurable to most people. Where the patient population is relatively static, the music aide will be well repaid by time spent on training quartettes or larger groups of singers. Such groups can be of value not only in any of the musical programs for the assembly hall but may be used on the wards, for religious services and on holiday occasions. If, as is usual, both sexes are represented among the patients, the range of selections will be limited only by the musicianship of the leader and the participants. The range of repertoire should be suited to all occasions and tastes from “barbershop” quartets to serious music. All possible arrangements of voices should be exploited with a view to competitive singing between sexes and among wards. The range of usefulness of this activity will of course depend to a large extent on the size of the hospital and the predominant age group. DIVERSION Music may also be used to help time pass less noticeably. Listening is enjoyable but does not focus or sustain attention in any way comparable to playing. There will always be patients interested in learning to play music. The instrument of choice will depend upon individual taste, which of course is conditioned by background, education, nationality, age, and many other factors. The instruments which will be most acceptable are those which are not too difficult to play and which emit a pleasant sound with ease for a long period.