A spark that connects the feminine spirit with its masculine counterpart can create an undeniable musical dynamic. And it doesnt always come from a place of lust or romance (though, lets admit, any sort of sexual tension or frustration can inspire incredibly timeless art—just see Rumours). This idea has especially taken hold among a generation of indie folk and pop couples and collectives, who, coincidentally, have been inspired by bands like Fleetwood Mac in creating homespun tales that reveal universal truths of love and heartache via big pop hooks—and sometimes some serious fiddle. Male/female harmonies are a key ingredient when creating the best type of clap-happy sing-alongs (Edward Sharpe & The Magnetic Zeroes), cathartic bursts of banjo-infused rock (The Head and The Heart), and acoustic ballads so intimate it feels sinful just to listen to (The Civil Wars). And, yes, some of these tracks do reflect real-life fireworks—or their dwindling remains—between certain band members (we miss you, Rilo Kiley!). -- Stephanie Garr
