I learned this hornpipe from Hugh Healy and Sean Vaughan. There are different versions “Chief O’Neill’s Favourite” (with only F# for example), but this is what I think is the most common setting in the area. You can listen to the tune in the video below.
X:1
T:Chief O’Neill’s Favourite
R:Hornpipe
M:4/4
L:1/8
K:Dmaj
|:fefg afge|fdec dBAG|FEDE FGAB|=cAd^c A2 de|
fefg afge|fdec dBAG|FEDF GBAG|1 F2 D2 D2de:|2 F2 D2 D2DE||
|:=F2FE FGAB|=cAdB =cAGB|Adde fded|=cAd^c A2de|
f2fg afge|fdec dBAG|FEDF GBAG|1 F2 D2 D2DE:|2 F2 D2 D2de||