Auld lang syne, written by none other than Robert Burns himself, is known the world over especially in connection with New Years Eve or Hogmanay, as the Scots say. In Germany it is usually sung with German lyrics. It is one of a trio of songs I use to finish off a ceilidh, the other songs being The Parting Glass, Irish and Come me Lads (Let union be), English.
Whilst in the Idle Fellows, Wilfried Drygala (who was not only a military buff but also a Scots buff, even to the extent of having his own complete Scottish regalia, kilt, dirk, the lot) sang it beautifully. The lyrics I sing can be found in Schottische Lieder und Balladen by Karlhans Frank.
By the way, auld means old, lang means long and syne means then or ago.

Lyrics