My Adeline was swimming
Sweet Adeline was singing
To the tune of Royal Canal
This lyric is a reference to the Irish song "The Auld Triangle," which was written by Brendan Behan as part of the play The Quare Fellow and was popularized by The Dubliners. It was also recorded and released by The Clancy Brothers & Tommy Makem under the name, "Royal Canal." Alt-J explained to NPR
that it "is a favorite song of ours to sing when we are traveling and/or drinking."