March of Cambreadth might put you in a mind to bust some heads.
Well along those lines . . . featuring 10x more gaelic kickassery and not even a smidgen of leather & oiled-up bodies.
So, trying a different tack dropzone, 'course whether it’s technically a “song” or not… 
The Haka. (trad. Maori war dance/song, now performed by NZ sports teams – usually Rugby)
Another version from a match against Tonga, where the Tongans responded with their own version.
Aye. Real Scots oil their weaponry, nae their chests.
Aye laddie, oiling the weaponry stops things getting worn under the kilt. 
I’ve always been stirred up by Follow Me Up to Carlow. Basically a recruiting song describing one of the Irish rebellions against the English. The lyrics were written 150 years after the rebels it’s calling to join had failed.
Full props to STB, but MOC hasd head-splitting, blood, guts, etc. And forget the goofy picture montage in the youtube link I posted; that’s just some wanker’s idea of what we should be looking at when we hear the song.
So just “hear the song.”
My contribution to a weirdly titled thread - The Bonnie Blue Flag.
Was also our fight song in high school. The music that is. It is rousing. The first few notes played on a trumpet or good bugle.