The Erdős-Bacon-Sabbath number throws together three measures of professional collaboration to make a rather fun parlour game. Assuming that the people in your parlour are three kinds of nerd and enjoy long and complicated internet scavenger hunts. Which we are and we do.
The game is to find a well-known person who has published academically, released a song, and been involved in a movie or TV show. Then, you play three versions of Six Degrees of Kevin Bacon: find a series of movies to connect them to the actor Kevin Bacon, a series of coauthored papers to connect them to the mathematician Paul Erdős, and a series of musical collaborations to get to the rock band Black Sabbath. Add up all the links and you get the Erdős-Bacon-Sabbath number.
It seems pretty astounding that anybody at all could be talented enough to have an Erdős-Bacon-Sabbath number. But since the founding of this site, quite a few EBS numbers have been discovered or conjectured: over twenty people are now known to have one, some via very interesting links! This website aims to be a comprehensive resource for Erdős-Bacon-Sabbath research: we keep track of the best and shortest paths for every member of the EBS club, complete with citations for every collaboration. Just to make it that much easier for you to learn about Natalie Portman's psychology research or Buzz Aldrin's moon rap with Snoop Dogg.