Limited Blue and White Swirl Vinyl. Glow In The Dark jacket. 2021 release, the sixth album by country musician Sturgill Simpson. The album consists of bluegrass renditions of songs from elsewhere in his catalog. As with the preceding volume, the album features various bluegrass musicians such as guitarists Tim O'Brien and Mark Howard, banjoist Scott Vestal, fiddler Stuart Duncan, and mandolinist/backing vocalist Sierra Hull. The album consists of bluegrass re-recordings of previous songs in Simpson's catalog.