'if you are talking about the general public who are no way involved in music and know nothing about it, it would be as insane to include their view of it into any definition.'

You obviously have no knowledge of lexicography, Jim. Lexicographers only go to experts for definitions of academic and technical words. The vast majority of definitions are drawn from trawling through the media to ascertain what common usage is, and this is largely governed by the man in the street's usage (the Folk)!