A super source for free online sheet music (early, classical, traditional) is:
http://www.musicaviva.com
You can spend many fun days on this site. Here's that site's webpage for Irish tunes:
http://www.musicaviva.com/tunebook/list ... untry&no=1
(Alternatively, to get to this page, enter the site, click on the Free Sheet Music link, then click on The Tunebook, then select music by country.)
Just select a likely tune and up pops a page with the score (you can print that page and thus have score in hand - very much like C&F's Tune-o-matic). You can also hear a midi version of the tune to see if you like it (for those who can't hear scores simply by looking at the notes - like me).
Yes, the tradition is aural. But thank God, for those who can't play by ear, a written form of communicating music was invented. Don't think any the less of yourself if you start with written notes and work toward self-expression from there!!
Now, have some toast & marmite, then floss well and go get 'em!
FE