Six degrees of Black Sabbath
it takes 16 steps to get from aphex twin to billy corgan.
I've been doing this for years: http://www.daz.com/
I wonder where they are getting their information from. Connecting Gnarls Barkley to Muddy Waters reveals the song "γγγεγΎγ§ε€±γγγγ" by Neil Diamond as a connection, which plays Neil Diamond's cover of "The Chanukah Song".