“Dans Kef” is in a sort of modified Orkney tuning I call Celto-Hawaiian, because it can sound like it’s from the islands. The tune is in fact a good case study in how to build your own Celtic arrangement.
Fingerstyle guitarist Steve Baughman shares an open-d acoustic guitar arrangement of the beloved Christmas carol "Silent Night" that lends itself nicely to slide treatment.
Here are some tips for arranging and playing Celtic harp tunes on fingerstyle acoustic guitar, using the piece "Squire Woods Lament" as an example.
These 17 solo arrangements in Celtic Songs for Fingerstyle Guitar are from the British Isles and beyond, in Orkney and other tunings, with standard notation, tablature, and performance notes.
Check out a fingerstyle arrangement of "Down by the Riverside” from this instructional songbook
While the song has an unmistakably religious lyrical message, its sweet melody should appeal to musicians of any philosophical orientation.
I encourage you to focus first on getting the melody down. Once you have that in your blood, you may feel free to explore your own bass lines and arpeggios.