I absolutely love this piece of music performed either by the multi talented pipe organ or the true Scottish pipes; bravo:

History of Highland Cathedral:
Often mistaken for a traditional Scottish song, this melody was composed by German musicians (Berliners fond of bagpipes) Ulrich Roever and Michael Korb in 1982 for a Highland games held in Germany.

It has become so popular that it has been proposed as the Scottish national anthem to replace unofficial anthems Scotland the Brave and/or Flower of Scotland.
The imagined story behind the words goes that under the reign of King James I of Scotland and England, all clan chiefs were asked to meet in a secret place, the Highland Cathedral (St Columba Church of Scotland, Glasgow), to pledge and ending to their constant feuding, and live in peace.
This they did (as intended) when Highland Cathedral has been played to emphasize the feeling of a National unity. Then peace reigned but, alas, only for as long as the king lived.
Pop singer Madonna chose "Highland Cathedral" for her church wedding ceremony in Scotland (December 2000) and the melody is also played in the movie “Four Weddings and a Funeral”.