Dave Grohl and Brent Hinds are both what type of artist?
Dave Grohl: David Eric Grohl (born January 14, 1969) is an American rock musician, guitarist, singer, drummer, songwriter, record producer, and film director. Brent Hinds: Brent Hinds (born William Brent Hinds; January 16, 1974) is an American musician best known as a member of the Atlanta, Georgia metal band Mastodon, in which he shares guitar duties with Bill Kelliher and vocal duties with Troy Sanders and Brann Dailor.
i don't know