Laura Marling and Michael Hurley show folk music's many forms

Marling soars on 'Once I Was an Eagle,' and the Hurley reissues 'Armchair Boogie' and 'Hi Fi Snock Uptown' stand up over time.Folk music over the years has taken many forms, has gone electric and returned to its roots, has moved in and out of favor as new generations discover, rework and reexamine the music. Below are new releases and reissues that celebrate the depth of English and American folk music.