Americana is a music that defies definition. It isn t rock, although it does encompass rock. It isn t folk, but folk is there. It isn t Celtic, but it is woven with Celtic threads. It is a blend of forms, music that draws on a wide range of influences. Gathering these many genres together, Americana continually reinvents itself and actively tells the story of its origins and its future. The Americana Revolution: From Country and Blues Roots to the Avett Brothers, Mumford & Sons, and Beyond is an informal social history that describes Americana as both a musical genre and a movement, showing...