As I've said before on here, the label "celtic metal" would imply that the band plays metal that would give the listener the feeling of celtic music. Aside from a bagpipe intro here and there that really has no bearing on the overall feel of the song, Korn doesn't remind me of any type of celtic music. The bagpipe they use to me feels more or less like an intro sample, like how bands insert movie clips before the song starts. The bagpipes in Korn's music seemed out of place with the rest of the song. When I hear the band, I don't think of Scottish music despite the pipes.

If wearing a kilt makes them celtic metal, what does that mean for Madonna??

It was also mentioned that all of these are just folk metal. That's true, but if you're looking for a band that is similar to Cruachan, and all you had to classify them was folk metal, you could end up searching through bands like Orphaned Land. One of my favorites, but nowhere near the same genre as Cruachan (O.L. is from Israel- think middle eastern metal!). It would be like searching for something similar to Celtic Woman with only the label "celtic music" as a guide, and winding up with Shane and The Popes. The more labels you give a type of music, the easier it is to find something similar to what you like.

Glad to see this thread still has some life, there is a lot of good music listed here. Even if you aren't a fan of typical metal, you might still want to check some of these bands out.