Sumer Is Icumen In is a really good canon. its upbeat too.
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Quenten Doolittle has written:
'Fantasy on Sumer is icumen in' -- subject(s): String orchestra
music, Scores
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The song Mr. Keating hums in "Dead Poets Society" is an ancient Latin hymn called "Sumer is icumen in," which translates to "Summer has come in." It is a song that celebrates the arrival of spring and warmer weather.
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Sumer was an ancient kingdom.The kingdom of Sumer no longer
exists.