When I'm not listening to the Jason Ellis Show on SiriusXM Faction I go for Folk/Pagan Metal, usually of the Viking/Celtic persuasion: Amon Amarth, Tyr, Enslaved, Waylander, Cruachan. That's been my jam recently.
Black Metal: Gorgoroth, Darkthrone, Mayhem
Sometimes thrash, Metallica, Slayer, Exodus, Tankard
Punk, Cancerslug, Rancid, Doom, Discharge, Misfits
Celtic, Boys of the Lough, Planxty, Paul Brady, Andy Irvine
Goregrind: Carcass, Exhumed, Disgorge
other times I go for good ol' Death Metal, Entombed, Suffocation, Death, Obituary or Death Breath
sometimes hip-hop: Immortal Technique, NWA,
Never ever jazz or anything electronic, that is not my jam
Damn, I almost forgot my country/bluegrass roots, sometimes I just gotta put on some Bill Monroe, or Hank Jr. I also have some old-time music that fits brew-day perfectly: The Carolina Chocolate Drops, Richard Bailey & Tammy Rogers, The Dust Busters