Professional Musicians?

How many professional musicians are here?

I'm curious because I'm passionate about music and am trying to work out the potential for a career in music. I haven't encountered much practical advice so far. Most hasn't gone much further than - 'Just do it and if you're good you might make it.'

So here I just want to gauge the music scene in Ireland and elsewhere. Who makes money off music? Who makes enough money to live on? Is it from an establishde band or session work? Covers, or originals? Is popular music the way to go or are there more opportunities in classical, jazz etc.?

I know that the music industry is hard to get into and I've no illusions as to how much hard work and commitment is involved. I'd like to hear stories and advice from people who have experience playing music professionally in whatever form it may take. Hopefully I can gleam some useful info for myself and others who are also thinking about this. (Also any pointers on other useful resources would be great, I haven't found much online!)