pavane what do you mean by "MAY be originally from Scotland"?

It's an Irish tune called "londonderry air" period!
The lyric was penned reportedly by a well to do english magistrate - but probably stolen from some penniless minstrel.

Black velvet band set in Barking - what a load of bollox.

Just own up the Irish have THE best musical tradition in these islands. The scotch & english are jealous.