Richard Bridge,talks about Irish style modulations.
modulation means changes of key,something that doesnt occur very much,in either Irish or English traditional songs,and not very often in Irish tunes,off the top of my head I can only think of the Galway Hornpipe.
I dislike the use of the words Irish , American,Delivery,it sounds as if all Americans,and all ,Irish use the same delivery.
Margaret Barry is very different from Packie Byrne or Sarah Makem,or Elizabeth Cronin ,Roscoe Holcomb is very different from Jean Ritchie.