a relational visualization chart showing the branches & connections of 100 years of music using the London Underground map. train lines denote different music styles (e.g. pop.soul, reggae) & are directional according to time, branch lines represent sub-genres (e.g. rock divides into grunge & psychedelia). stations represent music artists, so that key stations naturally are linked to the most eclectic artists. see also music similarity map & artist similarity visualization & music plasma.
[guardian.co.uk (pdf) & guardian.co.uk|thnkx Rajio]