To me a cover is good when the artist changes it a bit, or a lot.
Any one can just sing and play the song the same way and cover it.
thats lame:
here's a bunch that SHOULD BE PLAYED LOUD.
Actually, it would be a cover version, as it's NOT a "traditional" Irish song...It was written by Jimmy McCarthy in the late 1970's for Christy Moore, and was the title track of his 1984 album!