The Season 4 premiere features the successful jamband Widespread Panic who meld southern rock, blues-rock, funk and hard rock in a stellar performance.

Steep Canyon Rangers perform.

Cellist Dave Eggar, singer Amy Lee (of Evanescence) and dance troupe Hammerstep perform.

Jason Isbell and the 400 Unit perform.

The David Grisman FolkJazz Trio perform.

Singer-songwriter Lucinda Williams performs.

The Gibson Brothers showcase their amazing harmonies and whip-crack musicianship.

The frontwoman and the band sing through multiple generations and genres of New Orleans grooves.

The eclectic jazz, funk, reggae, alt-rock guitar virtuoso joins the stellar Traveling McCourys.

Shovels & Rope perform.

Singer-songwriter Hayes Carll performs.

The Grammy nominee stirs up his own particular stew of folk, country-rock, pop and Western music.

Singer-songwriter Chip Taylor, whose songs include "Wild Thing" and "Angel of the Morning," performs.