"The Auld Triangle" is a song, which was first performed publicly as a part of the play The Quare Fellow (1954) by Brendan Behan. The song is used to introduce the play, a story about the occurrences in a prison (in real life Mountjoy Prison where Behan had once been lodged) the day a convict is set to be executed. The triangle in the title refers to the large metal triangle which was beaten daily in Mountjoy Prison to waken the inmates ("The Auld Triangle goes Jingle Jangle"). It was recorded by The Clancy Brothers & Tommy Makem, Liam Clancy, Ian & Sylvia, The Dubliners and others. This is approximately the tune sung by The Clancy Brothers & Tommy Makem.