It's Slade's song Merry Xmas Everybody. This song was also
covered by Rooney.
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"Xmas" is not hyphenated.
So the correct grammar would be "Merry Xmas to everybody".
Alternatives to "Xmas" are:
Christmas
Crimbo
Crimby
Holidays
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Merry Xmas Everybody by Slade, however the lead singer Noddy Holder screams out "It's Christmas!" toward the end of the song not at the beginning.
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The video Merry Christmas Everybody by the group Slade can be
watched at the following videosites: Youtube, Dailymotion,
Musicloversgroup, Fanpop and Songstube.