History of Traditional Irish Music?

I'm wondering how traditional vocal songs were circulated over all of Ireland. Without the mass media production that we have today, how was it possible for people all over the country to know so many of the same tunes? Also, did the music evolve or has it stayed the same as when it was first written or is it... show more I'm wondering how traditional vocal songs were circulated over all of Ireland. Without the mass media production that we have today, how was it possible for people all over the country to know so many of the same tunes? Also, did the music evolve or has it stayed the same as when it was first written or is it possible to know this?
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