In books like Petrie’s 1855 and 1882 works, and Joyce’s 1873 volume of Irish airs and songs, I see that harmonics were added so that there is something in the bass clef.
I realize that there are some harp tunes here and there, and those would naturally have had harmonics, but I assume that very few of the harp tunes in these volumes were ever heard on the harp, given the weakness of the harp in Ireland in the 1800s.
But it seems that most of the tunes are for fiddle, whistle, or pipes, or the human voice.
So, is it safe to assume that the added left hand piano harmonies are, just that, added based on personal judgment?
I see that the arranger also added some harmonics in the treble clef in these volumes, where the urlar itself is (not just added fifths or eighths, but also thirds).
I have seen negative comments about this in one of the old texts, in particular, regarding the added harmonies in Petrie’s 1855 "piano-forte" work.
I ask because I play piano, as best I can.