Mixing Celtic pipes and whistles with Mexican accordions and guitars proves a fusion too far, even for the Chieftains' intrepid Paddy Moloney. San Patricio is his tribute to the American brigade, mostly Irish, who swapped sides in the 1846-48 US-Mexico war, and who were later executed as deserters. It's a sad piece of history, but the cantina folk here, by the likes of Lila Downs, has little bearing on it. Moloney's own pieces are sentimental, leaving only Ry Cooder's splendid "The Sands of Mexico" to articulate a tangled tale.