It can be safely assumed that Zac Brown's hair isn't always Atlanta Falcon colors, but for perhaps the first and only time fans have visual evidence that Voldemort isn't hiding beneath his beanie. National Anthem performances are rare opportunities to see artists like Brown without their hat. It wouldn't be good form to insist upon keeping the cap while singing, and most country stars are proud to follow tradition. You'll see he's holding his beanie, so it soon covered his colorful hair again.