Jason Isbell and the 400 Unit, joined by acclaimed singer‑songwriter Patty Griffin, perform a roots‑tinged concert at the Filene Center at Wolf Trap in Vienna, Virginia. Isbell blends literate Southern‑rock and Americana with the 400 Unit’s full‑band sound, while Griffin contributes her folk‑ and Americana‑rooted songwriting, offering an evening that spans country, rock and singer‑songwriter traditions. The Filene Center is an iconic outdoor concert amphitheater in a national park that provides both covered seating and a lawn setting for this live‑music event.