The chords I posted yesterday are not played in that sequence only . They are used to accompany tunes in E Dorian mode. In the posted sequence the chords represent Em,D,C,Bm. The low E drone is similar to the drone of pipes . There are many more chords + bass & melody fills. There are similar chords for A Dorian, x,0,7,9,10,0. A large number of the minor tunes in Irish trad are in E or A dorian with a range of about one and a half octaves. There are no set chords for the tunes, you just got to invent. I will try to put up some examples in Off Topic later.
Derm