I've found something quite interresting.. me myself I like Metal music, and much higher % of people working with it seams to do the same then what I am used to be common in a population. Maybe it's because Metal is quite complex and in some way very similar to classic (I like that too actually). And if you are an IT person you need to be able to handle more complex issues then some other jobs. Now, this my personal experience and not a report but it's what I've come to belive, that some people with some interrests likes more complex music etc.