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Sparky, I was hoping to use something instrumental and last night thought of the "obvious", i.e. Hadyn's Clock Symphony (2nd movement). but I'm not sure if it will be obvious to the audience, unless they know it. Whilst searching for that, I also found reference to Bach's Clock pieces music that I hadn't heard of, and one of those may be suitable. If it's ok with you I'd like to put your kind offer on hold for the time being, and contact you if necessary.
Thanks once again.