What in the hell is “thrash grass”? If you guessed a blend of thrash metal and bluegrass, you’re almost there. The Native Howl created the genre in 2015, though they have been playing music together since their high school days. This Leonard, Mich. foursome labeled themselves as traditional metal fans until they attended Wheatland Music Festival. After soaking in some high-octane folk vibes at the fest, they penned the track “Thunderhead” — and thrash grass was born. Though they are in the middle of a national tour, the boys are stopping close to home to release their new record Out of the Garden and Into the Darkness.