The Avett Brothers’ sound is a comprehensive sample of traditional American music: bluegrass, country, folk, rock and roll, indie rock, honky tonk, ragtime—there is no rooted genre that is not present in their repertoire. With these credentials they could not be left off the lineup at Azkena, a festival that in its 20 years of history has seen Americana icons such as Lucinda Williams, Wilco, Imelda May, or the great Emmylou Harris, one of the big stars who will visit us this year.