Take your top 20 artists. For each of these artists, collect the top 5 similar artists. The resulting number of unique artists is your eclectic score. If the score is small (extreme = 5) your musical preferences are very limited, and if it is large (larger than 80, extreme = 100), then you have an eclectic musical preference. You can compute your own score at http://anthony.liekens.net/pub/scripts/last.fm/eclectic.php
My eclectic score is currently
86/100
The 86 related artists for my profile are "Weird Al" Yankovic, 2Pac, 50 Cent, Al Green, Alice in Chains, Arctic Monkeys (2), Arena, Babyshambles, Basement Jaxx, Beastie…