I usually run a Pandora channel that started with Rancid, so I get all kinds of new and old school Punk. Over time I have added some different things to the channel including J. Roddy Walston and the Business (new album coming soon) so I usually wind up with a mix of punk, folksy bluesy rock, including the likes of Black Keys, White Stripes, QOTSA, some older Pixies, Dead Milkmen, Jane's Addiction and all of my other favorites. As said before, its kinda just there in the back ground when I'm busy measuring, adding, mashing in, etc; but I listen intently while watching wort boil and chill. Laptop outside with tunes and Beersmith II for me every brewday.