Irish folk music, for the most part, remains strongly traditional. That said, it’s easy to forget that the ubiquitous bodhrán – an ancient instrument – didn’t claim widespread legitimacy in the Irish folk idiom until the 1960s, much in the same way that the cajon only filtered into the fiercely conservative flamenco tradition in the 1970s. Traditions evolve, even in seemingly diehard cultures, just as everything else in nature evolves. Buille, which means ‘beat,’ has danced to its own rhythms since it was formed by Cork-based Armagh brothers Niall and Caiomhin Vallely in 2005, releasing three albums of roots-based, genre-bending…