Thanks for your help everyone. I came across the wiki article, but I think Professor O Tuama is a different person to Sean *Og* O Tuama, who was a harpist and collector. I came across the name while researching 'Deus Meus adiuva me', recorded by Na Fili back in the 1970s, a song which I know has generated much discussion here. It appears Og O Tuama either wrote or adapted the melody most often associated with 'Deus Meus'. I remember reading or hearing somewhere he died in the 1980s. He gets a brief mention in O Canainn's 'Traditional Music' as the author/editor of a book called 'An Choisir Cheoil' but that's about as much as I have to go on. Thanks again everyone for your quick response and assistance. Much appreciated!