There is a current trend in music that's been happening over the last 5 years where a lot of bands have started to shift towards folk rock. Two such bands that encompass this are Fleet Foxes and Monsters of Folk. Instead of boring you with my insights, take a listen for yourself (skip the ads at the beginning). The first is a band called Fleet Foxes that have such beautiful harmonies as evidenced by the first song they play (or sing-there's no instruments). The second band is a band called Monsters of Folk that is a super group of sorts made up with four guys that became famous by playing in other bands but shared a common love for folk music. They, too, have beautiful harmonies. Hope you enjoy.