Good, but not yet there.
I listen to the celtic genre a lot, should it be from others here on Newgrounds or the "pros" out there on the internet and while this is a good song, it makes me feel like it is missing something.
I might be wrong, but most of the celtic songs I listen to are either very peaceful or they make you want to dance. Yours is like inbetween those two categories. Personally, I prefer the more energetic ones.
I'll give you a 4/5 and a 8/10, because the effort was there, but to me, it feels like it is missing something. It is still a very neat song to listen to, you did a good job.