Found this here:

http://www.musicianguide.com/biographies/1608003175/The-Chieftains.html

Sean O Riada, a classically trained composer and performer, envisioned something different and formed Ceoltoiri Chualann, a sort of Irish folk orchestra. He was joined by several future Chieftains; Moloney, [Martin] Fay, Sean Potts, Michael Tubridy, and Peadar Mercier. O Riada's experiment eventually became the norm and before long ensembles were common.
In 1963, Moloney, Tubridy, Potts, Fay, and David Fallon formed the Chieftains...
Tubridy on flute and concertina, Potts on tin whistle, Fay on fiddle, Fallon on bodhran (a goat-skin drum), and Moloney on tin whistle and uilleann pipes.