I don't specifically 'follow' a genre as the stuff I like comes from all over the (musical) place. I THINK that most of the stuff I like stems from 70's Prog Rock, so I opted for "Rock, Metal..." option, but I also like instrumental Irish music (e.g. the original 'Riverdance'), the Cocteau Twins (who are in an untitled genre of their own, in my view), The Groundhogs (whe WERE a blues band, but moved on) and quite a few German bands of the 70's (Neu, Tangerine Dream, Faust, etc).
I have a feeling it's been done before, but (in my case) it would probaly be better to ask "Who do you like", rather than "What do you like". Just a thought. Another thought could be to request what people have in their collection(s) and attach it to a post on an Excel Spreadsheet.