Back for its second year, Beat Root, Moving On Music’s festival of roots music, offered a program as diverse as imaginable, from harps, fiddles and thundering rock to singer-songwriter mastery and psychedelic folk.  Traditions, and the bending of them, were the constant dualities at play across four evenings of uplifting music, that taken together, amounted to one of Belfast’s best music festivals of the year to date. Though often associated with formal recitals, the harp can be one of the most expressive and one of the most thrilling of instruments – just think of Colombian Edmar Castaneda or Shetland islander Catriona…