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Take a look at last.fm and their API - they have a pretty good relevant artist graph.

I made something to show it off a year or so ago: http://richardlyon.co.uk/coffee/lastfm.php?artist=mogwai (switch from 3d to 2d if it's being a pain, change artist in URL to something you like)

I dont suppose its open source is it? I'd really like to see how you've done it / what you used. Is it on gitHub?

UPDATE: @richthegeek, Thanks much appreciated.

A more update version of the graphing program (without the lastfm stuff) is visible at http://richthegeek.github.com/coffeegraph