The (London)Derry Air was collected in Ireland, but scholars have linked it to a Scottish tune as possible origin. Danny Boy words were by Fred Weatherly, possibly the most prolific songwriter of the era.

The earliest known version of Black Velevet band, C1820 and set in Barking, can be seen on a broadside at the Bodleian Ballad Library.
There are many versions set in different places.

Black Velvet Band