I totally agree there is a correlation between industrial areas and the music within those areas. I think maybe growing up in an area heavily industrialised influences your outlook on life and consequently music.

Many industrialised areas have spawned producers of music with an industrial edge, like you said birmingham, detroit, a large number of german cities are highly industrial, and a lot of the music coming out of them has elements of this in it. Where i come from (Oldham), there is a lot of industry, and same in the surrounding areas, escpecially yorkshire, leeds and huddersfield in particular, and there is a great deal of techno artists and clubs in these areas (the orbit for one).