I think I figured out the melody line - by process of elimination as there just aren't enough notes in the other lines - the bass clef is definately piano chords. I'm not going to try to set the lyrics to this one though - and the start of the chorus is marked in the music - so *that* is a definate.

interesting that the time is given as dotted quarter = pendulum 27 inches. truly the length of the note....

X:1
T:BÍMID AG ÓL, AG ÓL, AG ÓL
N:Petrie's Ancient Music of Ireland
I:abc2nwc
M:6/8
L:1/8
K:F
f f f f f f|_e e d e2c|f g f|f e d c2d/2 e/2|
f f f f f f|f _e d e2c/2 B/2|A A A B G G|
c B A B2"^Chorus:"G|F F F A2A|B2A G2F|F F F A2A|
B2A G3|F F F A2A|B A B c2f|f _e d e d c|B G F F2z