Pretty much everything from classical, blues, classic rock and jazz to thrash and melodic death metal. Old school rap/hip hop. Not interested in pop music, it's generally rubbish aimed at the poor taste of the mob.

Led Zeppelin, Jimi Hendrix, Cream, Metallica, Slayer, Megadeth, Pink Floyd, Buckethead, Joe Satriani, Steve Vai, Jason Becker, Paul Gilbert, Arch Enemy, Black Sabbath, Ozzy Osbourne, Black Label Society etc

House, The Mentalist, The Big Bang Theory, How I Met Your Mother, etc

Stephen King, Christopher Hitchens, Richard Dawkins, Kurt Vonnegut, Hunter S Thompson, JRR Tolkein, William Gibson etc

Outer Space. Anywhere I can get a good view of the stars, I'm happy.