"Angels We Have Heard on High" is a Christmas carol (1862)
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Angels we have heard on high,
Singing sweetly through the night,
And the mountains in reply
Echoing their brave delight.
Gloria in excelsis Deo.
Gloria in excelsis Deo.

Shepherds, why this jubilee?
Why these songs of happy cheer?
What great brightness did you see?
What glad tiding did you hear?

Refrain

Come to Bethlehem and see
Him whose birth the angels sing;
Come, adore on bended knee
Christ, the Lord, the new-born King.

Refrain

See him in a manger laid
Whom the angels praise above;
Mary, Joseph, lend your aid,
While we raise our hearts in love.

Refrain
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http://en.wikipedia.org/wiki/Angels_We_Have_Heard_on_High