Heart's Wilson sisters may be one of rock's most ferocious, enduring, iconoclastic partnerships, but delve into their deep cuts, and you'll discover their softer side. Ann Wilson's Rufus Wainwright collab “A Hard Rain's a-Gonna Fall” is a rootsy folk lament, her raw vocals studding the gentle instrumentation like stars in the night sky, while “Hey You” nods to the group's penchant for country.