The ceremonies will be attended by other invited royals and high-ranking dignitaries, including Britain's Prince Charles and the Duchess of Cornwall, Prince Felipe and Princess Letizia of Spain and Denmark's Crown Prince Frederik and his wife.

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He supported his idol Louis Armstrong in 1968 during his last European tour and played at the wedding reception for the Prince and Princess of Wales in 1981.

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That evening, Prince Hans-Adam II and his wife, Princess Marie von und zu Liechtenstein, invited the Secretary-General and Madam Ban to dinner at their residence, Vaduz Castle.

UN: Secretary-General