You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when was o canada proclaimed the national anthem?" whose answer is 1939.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when was o canada proclaimed the national anthem
Useful Output:

Doc 1: On July 1, 1980, Governor General Edward Schreyer proclaimed the Act recognizing this as the official national anthem of Canada. Music: O Canada
Doc 2: O Canada, national anthem of Canada. It was proclaimed the official national anthem on July 1, 1980. “God Save the King” remains the royal anthem of Canada.
Doc 3: The House of Commons breaks out into song as O Canada is proclaimed just before Dominion Day 1980. Just in time for the country's national
Doc 4: On Canada Day, July 1, 1980, in a public ceremony featuring the descendants of Routhier and Weir, O Canada was proclaimed the official national
Doc 5: “O Canada” came into being in 1880, 100 years before it became Canada's National Anthem. The song was commissioned by the Lieutenant-Governor of Quebec.