While the Avett Brothers' music has roots in traditional folk and bluegrass, it also captures the high spirits and no-boundaries attitude of rock & roll -- which is appropriate, since rock is where Scott Avett and Seth Avett first cut their teeth as musicians. After releasing a self-titled debut in 2000, what was originally an acoustic side project quickly became their primary focus, and they expanded the lineup while developing a reputation for exuberant live shows. The band's first of many live albums, Live at the Double Door Inn, saw release in 2002. They were incorporating...