Sean Óg was a friend of my fathere Colm ó Lochlainn ( largely credited as the energy behind Claisceadal ) and they collaborated , as far as I know ... I have a sense that some of his collections, such as Cóisir Cheoil, may have been printed at The Sign of the Three Candles .. but I m not a good one for dates . . correct me if anyone has more precise knowledge..