Caoimhín Mac Aoidh is a fiddle player steeped in the Donegal fiddle tradition. He has learned from and played with many of the greats of Donegal fiddle music. Caoimhín is a founder member of Cairdeas na bhFidléirí and has served a term on the Board of the Irish Traditional Music Archive / Taisce Cheol Dúchais Éireann.

Caoimhín has authored a number of books, collections and articles on the Donegal tradition. He acted as a contributor on topics of traditional music to the Encyclopaedia of Ireland as well as to The Companion to Irish Traditional Music (eds. I and II). Caoimhín has broadcast and lectured on a variety of topics relating to Irish traditional music. He has taught fiddle at numerous events and performed in both solo and group contexts.