Andrew mentions this Register-Article which he deftly summarises:

UK “accelerated learning” company recently did a survey of the contents of MP3 players owned by various types of IT professionals and found relationships between career niches and musical tastes. Microsoft weenies, apparently, are into shiny mainstream pop like Britney Spears and Dido, penguinheads are into “electro” like The Orb and Kraftwerk (and, I imagine, a lot of industrial/EBM bands the researchers haven’t heard of), developers are into metal (Megadeth, Iron Maiden and Slipknot), and the coolsie chat types who listen to The Smiths and Suede tend to congregate around database administration careers for some reason. Project managers are into Queen and the Rolling Stones, security wonks are into ’60s psychedelia (maybe it’s the beards or someting?), whereas, for the management, it’s all classical music. Nope, no stereotypes here.

I can agree with the tastes of the security folk, or at least those older than myself, particularly the American ones; me, I’ve never really appreciated any of Dead/Doors/Hendrix (which El Reg cites as favourites of Security Hackerdom) – but then most of the uber-security folk I work with are rather older than me.