I heard about the San Patricios while running down what I figure to be incorrect liner notes from Great Bigs Sea's ALbum "Play" where it is stated the sea shanty "General Taylor" is about an American turncoat officer in the Mexican-American war. The only turncoats I can find are the San Patricios.Upon reading Stan Hugil's book it seems like that info is off, and the song is in fact about Zachary Taylor. The song is from a family of shanties known as Mr. or Masa Stormalong. This family includes the shanty Santi Ano, where Zachary Taylor is mentioned by name.
So it is my suposition that General Taylor may well have been a version that was by members of the San Patricios, not about them.
So if I am right I dont know any songs about The San P's, but if I am wrong I do. Follow?
Nick