Tell her I will is almost certainly better known as Gallagher’s frolics, but I couldn’t resist the alternative title because it is often played with Tell her I am and this way the two tunes can follow each other in our list.
There are lots of good places to hear Gallagher’s/Tell her I will on youtube.
Martin Hayes and Dennis Cahill playing it live with Tell her I am
Useful tin whistle tutorial
Fiddle and cello with some great rhythm second time around
Guitar (chords and then melody)
Another fiddle and guitar