My suggestions will be a bit dated... many of my favourite groups are from the 80's and even 70s...
They are traditional groups, not rock
Scottish:
Tannahill Weavers
Old Blind Dogs
Kentigern (this is an obscure Scottish band from around 1980... probably hard to find)
Irish:
De Danann
The Bothy Band
Danu
Altan
You can get on Pandora and find all kinds of stuff
Proud Mountaineer from the Highlands of West Virginia; son of the Revolution and Civil War; first Europeans on the Guyandotte
Bookmarks