Question: Who produced the Sturgill Simpson album that was nominated for a Grammy Award for Best Americana Album?
Sentence (from "Sturgill Simpson"): His second album is notable for being nominated for a Grammy Award for Best Americana Album, being listed 18th on "Rolling Stone's" "50 Best Albums of 2014," and also being named among "NPR's 50 Favorite Albums of 2014."
Relevant evidence: Yes