ROUNDS - bet there are lots in Irish music
I and my Mum used often to sing rounds together. i.e. you start the song then the 2nd starts a line later. 3 part, 4 part rounds possible with enough voices. (Nice if you’re walking under a disused railway bridge and get that echo too!). "Drops of Brandy" (slip jig) would make a great round on flute, fiddle or whatever!