If solo then nothing as I find it distracts me. If out with friends then music usually ends up going on and it is usually heavy metal... bit of a contrast to nature... Lamb Of God, Machine Head, Korn, Cannibal Corpse to name but a few. It does all get mixed in with Lynyrd Skynyrd, Hayseed Dixie, Johnny Cash, Rancid, Jethro Tull.... We have had people approach during the evening/night who have been very worried by the music but as soon as a brew and a biscuit is offered they usually calm down a fair bit.