Not necessarily. Their main focus is Irish Traditional Music and that will be the archive's core collection. It is only natural there will be areas in the collection that, while relevant to the core collection, will not be 'Irish Traditional Music'.

It is also worth considering the long standing influences Irish and Scottish music, and indeed English and American music, have had on eachother. Each sending songs and tunes across and adapting and adopting them into their own national repertoire. It has been going on for centuries and it isn't going to stop any time soon.