Nigel, welcome. Since you haven't really described "needing music" in detail, I'm left wondering if the discussion so far hasn't been at an unnecessarily complex level. If the music isn't directly related to your business activity, but is just for a pleasant background, it would seem that placing an inexpensive compact stereo system in each room might be satisfactory. This would probably be less expensive and certainly would be less complicated.

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Enjoy the music, not the equipment.