The Alabama-bred sisters are in a contemplative mood on the first duets set of their decades-long careers. They harmonize enchantingly, adding a special sibling something to selections from The Louvin Brothers ("Every Time You Leave") and Merle Haggard ("Silver Wings”). Outside their country comfort zone, the women imbue The Killers' "My List" and Nirvana's "Lithium" with new meaning, while their version of Dylan's remarkable title track is one for the ages.