Mmmm... Looks like I had the right man in my head - but the wrong book. Sean Og (1912 - 1980?) published a set of booklets of songs in Irish called "An Choisir Cheoil" - of which I have one! For a photo of the man:

Click here.

- and it was he I met at the conference, rather than Prof. Sean O Tuama!

Regards