Science of production, transmission, reception, and effects of sound. Also, in a room or other locations, those characteristics that control reflections of sound waves, and thus the sound reception in the room.
"What I sent you ws a high fidelity record I first heard in 1957. It has been played all these years and moved 19 times, four times across the pacific ocean. It is very dear to me and I was afraid to play it anymore (even if I still had the equipment which I now do not) for fear of losing it forever. When I received your package and put it on ..."