http://www.royal.gov.uk/RoyalEventsandCeremonies/SwanUpping/SwanUpping.aspx
from British Royal official site.
I leave you to read for yourself and find out what that is.
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https://www.google.com/search?client=firefox-b-1-d&q=Famous+Chinese+tenors#fpstate=ive&vld=cid:12005ab7,vid:_d4ap5I_tmk,st:0
