I have 3 CDs in my car at all times: Ensiferum (metal), Dragonforce (metal), and Symphony of Science. The radio stays on a rock channel, because I'm convinced it is the only non-country radio station in my county. I could use some more metal CDs, like Blind Guardian and Nightwish, but I need a CD that plays the Mario Kart soundtrack and just have that thing on repeat. It'll make driving 10x more fun.