Opera glasses <joke> Wear what you would wear to the opera
in Seattle / New York / London / Paris / etc.
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There are several 'famous' opera companies in the United States,
including but not limited to, The New York Metropolitan Opera, The
San Francisco Opera, The Houston Opera, The Chicago Opera and so
forth.
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I accompanied him in a recital at Seattle. He was very easy to
work with. This was in 1978. Last I heard, he was teaching at
Indiana University, among other things.