“Testify is part of a larger Native American heavy metal tradition that exists on reservations around the country. Some bands, but not all, use the term Rez Metal to identify themselves.
“The genre has been a dominant musical force among young people on reservations since at least the 1990s, along with rap, according to Ellen Bello, a New Yorker who founded the Native American Music Awards in 1998. She has worked extensively with [First Nations] bands of all types and hosts an award show each year; many entries come from metal bands.
“The popularity of heavy metal, Ms. Bello said, comes from its cathartic nature — making it attractive to young people in depressed regions — as well as its heavy use of drums, a mainstay in native culture. It is played at parties and concerts, while more traditional music is reserved for ceremonies.”