As a non-Irish speaker, it looks to me like Sarah is looking for three separate Irish songs/tunes:
- bi losa im chroise
- stor mo chroi
- an bposadh bhi gcana
Helen has provided links to the first one, Jeri has posted the second which is also here in the Digital Tradition database. That just leaves #3 and I'm sure someone like Aine, Philippa or Annraoi would be able to dig it out.
Wassail! V