I would worry that there is bias inherent in approaching any community of people for data; after all, there are a number of qualities which have drawn and held all of us to this particular website, which may not be specific to fans of music in general. I would caution that out community is likely not representative of music fans on the whole, and that you will want to seek a much greater sample of fans in order to balance your data out.
EDIT: Presumably as a researcher you are aware of the basics of statistics, but I am simply looking for clarification for my own interests in your survey.
