Artist

Jason Isbell and the 400 Unit

Muscle Shoals, United States • Formed 2009

Jason Isbell and the 400 Unit is a music group from Muscle Shoals, United States, active since 2009. Their discography on Gatefold includes 11 records.

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Albums tracked

143

In collections

2009

Since

Biography

Jason Isbell and the 400 Unit is an Americana / Southern rock band originating largely from the Muscle Shoals area of Alabama, and led by former Drive-by Truckers singer / guitarist Jason Isbell. The band consists of Isbell (vocals, guitar); Sadler Vaden (guitar); Jimbo Hart (bass); Derry DeBorja (keys, accordion); Chad Gamble (drums). Fiddle player and singer Amanda Shires features regularly as a session player and occasional touring member. The

The Arc of Jason Isbell and the 400 Unit

The pivots — what forced Jason Isbell and the 400 Unit to reinvent.

The Post-Truckers Hangover
After the split from Patterson Hood and Mike Cooley, Isbell formed the 400 Unit with Muscle Shoals stalwarts like Jimbo Hart and Chad Gamble to prove he could lead his own circus. These early records like the self-titled 2009 release have a gritty, unpolished Muscle Shoals soul influence that felt a bit scattered. You can hear a songwriter with world-class chops still trying to figure out if he wanted to be a rock star or a folk singer. It was loud, messy, and honest, but the songwriting was often fighting for space against the arrangements.
The Cobb Transformation
The pivot happened when Isbell got sober and teamed up with producer Dave Cobb, who forced a new discipline into the recording process. By the time they got to Something More Than Free, the 400 Unit had transitioned into a precision-weighted ensemble where every note from Sadler Vaden’s guitar served the lyric. The production moved away from the Southern rock tropes of the early days toward a clean, high-fidelity clarity that showcased Isbell’s vocal range. This era redefined the band as a powerhouse that could pivot from a whisper to a stadium-sized roar without losing the narrative thread.

Influences

The Allman Brothers Band — Isbell grew up in the shadow of Muscle Shoals and has frequently cited Duane Allman's slide work as his primary guitar manual. You hear it in the dual-guitar harmonies he shares with Sadler Vaden, specifically on tracks like 'Honeysuckle Blue.' It’s that Southern fluidness without the bloat.
John Prine — Isbell often calls Prine his favorite songwriter and the two became close friends, even performing together at the Ryman. The influence is all over the character sketches in Isbell's lyrics, where a single mundane detail tells a whole life story. He learned how to be funny and devastating in the same verse from Prine.
Candi Staton — Before he was a rocker, Isbell was a kid hanging around FAME Studios where Staton cut her best work. That Muscle Shoals soul lineage is the backbone of the 400 Unit’s rhythm section. It’s why their ballads have a swing and a depth that Nashville session players can't quite mimic.
Neil Young — The 400 Unit frequently covers 'Like a Hurricane' and 'Cortez the Killer' in their live sets to stretch their improvisational muscles. Isbell mimics Young’s 'Ragged Glory' era tone—that high-gain, edge-of-feedback sound—whenever the band decides to move away from the acoustic stuff. It provides the necessary grit to balance the polish.
Guy Clark — Isbell was a disciple of the Texas school of songwriting, specifically Clark’s 'no-waste' approach to a stanza. He’s mentioned in interviews that Clark taught him that a song is a piece of furniture—it has to be functional and built to last. You hear that craftsmanship in the structural integrity of a song like 'Elephant.'