Generate your own musical cloud.
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
The 76 related artists for my profile are 30 Seconds to Mars, Alexisonfire, All Time Low, Atreyu, Bad Religion, Biffy Clyro, Blink-182, Boys Like Girls, Brand New, Bright Eyes, Cartel, Colonel Claypool's Bucket of Bernie Brains, Cute is What We Aim For (2), Dane Cook, Dashboard Confessional, Dave Attell, David Cross, Death Cab for Cutie (2), Deli Creeps, Exodus, Fall Out Boy (5), Fightstar, Flogging Molly, Frou Frou, Fumie Kumatani, Fumie Kumatani & E. …