Black Sabbath + Madeleine Peyroux

I was browsing the iTunes music store tonight and happened across Geezer Butler's celebrity playlist. He's the longtime bassist of Black Sabbath -- a band famous for ushering in a new era of hard rock, with a macabre subtext :) In contrast to the dark sound Sabbath is known for, Geezer has quite an ecclectic mix of blues (e.g. madeleine peyroux, etta james), country (e.g. alison krauss), electronica (e.g. lamb), and, of course, slayer.