Bob Dylan's iconic 1962 song "A Hard Rain's A-Gonna Fall" stands at the crossroads of musical and literary traditions. A visionary warning of impending apocalypse, it sets symbolist imagery within a structure that recalls a centuries-old form. Written at the height of the 1960s folk music revival amid the ferment of political activism, the song strongly resembles--and at the same time reimagines--a traditional European ballad sung from Scotland...