There is no harmony like brotherly harmony. Something indelible in the weave of voices and play of sensibilities is stamped into the fraternal DNA and also stems from a lifetime of shared experiences. You can hear it in classic brother acts across the musical spectrum, from the Louvin Brothers to the Everly Brothers and on down the decades through the Wilson brothers (Beach Boys), the Davies brothers (Kinks), the Allman Brothers and even the Brothers Gibb (a.k.a., the Bee Gees). You can clearly hear fraternal magic at work in the songs of Scott and Seth Avett, better known as the Avett Brothers, as well.