The orchestra is tuning up to the standard A, probably 440 Hz. The strings play their A string and then other strings, D, G and E, perfect fifths. I don't know what the wind players do to tune, concert A for sure, but I don't know what else they play.
Pugg, what happens? Is there a message saying something like "This video is not available in your country" or something? Or was YouTube just not working? You can also play the track at the other link I provided, at CD Baby. It's "Intro".
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