O'Crowley had a business in Cork (T. Crowley and
Son, 10 Merchants Quay, Cork, Erie) and he
published a music book entitled "Crowley's
collection of music for the Highland or Irish
Bagpipes, compiled and arranged by Tadhg
O'Crowley" which was released in 1940. He
published another book "How to play the
Uilleann Pipes" in 1936.
He was a maker of Irish Uilleann pipes. These instruments are highy regarded today and frequently mentioned alongside of Kennedy and Rowsome Uilleann Pipes. The business closed in 1960 with Kennedy buying up the tools and stock.