Heavy Trip is about a Finnish death metal band trying to get to a Norwegian festival they've been booked at in order to make it in the big time. The band ends up robbing some graves and getting in a bit of armed conflict among other things, but who hasn't been there? The film will premiere at SXSW on March 10 and you can check out a trailer for the movie above.
Also, no. The sheriff looking guy is not a hybrid of Mastodon's Troy Sanders and Brent Hinds.