You might already know this, but “Auld Lang Syne” — as in the traditional song we sing when the clock strikes midnight on New Year’s Eve – basically means “old times” or “days gone by.”
The song as we know it today is mostly attributed to Scottish poet Robert Burns, who put down the lyrics in a poem in 1788, based partly on old Scots folk songs, and partly on his own composition.
The familiar melody is an old Scottish tune, though it may have originally been played in a much quicker tempo.
At least that’s one history. There are other explanations and arguments out there.