I remember a page (flash based?, it was like 7 years ago i visited it) where the genres were displayed as a graph, with edges between related genres, and I think you could listen to samples on each of the nodes (or maybe it was only artist suggestions)
It was a great tool to discover genres close to the ones you like, and you could traverse further out in your comfort zone.
It could also have been that it was not genres but artists as nodes, and similar artists as nodes with relations, but they were clustered in similar genres.
Anyone know what tool/site I'm referring to? Are there any pages like this today?