In NC, there are no restrictions on bands playing and very clearly stated as such. Officials have been told over the years that we cannot flag (or otherwise reprimand) the band.
That being said, I have been in a few games where we've had to tell the people in the press box to knock it off - both playing sounds over the PA at volumes much louder than a band could play, and making the stadium lights blink at inappropriate times. I've never had a case where they didn't listen to us though, where we'd have to escalate to a flag or something else though.