Undoubtedly you've seen this particular quiz before. I'm a fan because the database is doing all the work. Anyway...

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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 94 related artists for my profile are Alice in Chains (2), Avengers In Sci-Fi, Balkan Beat Box, Bauhaus, Bob Mould, Bugy Craxone, Buzzcocks, Cabaret Voltaire, Camouflage, Ciccone Youth, Coldplay, Colin Newman, Collide, Cranes, Damon Albarn, Dave Gahan, DeVotchKa, Desert Sessions, Dinosaur Jr. (2), Eagles of Death Metal, Echo & The Bunnymen, Eddie Vedder, Electronic, Elvis Costello & The Attractions, Emir Kusturica & The No Smoking Orchestra, Erasure, Foo Fighters, Frank Black, Frank Black and the Catholics, Gang of Four, Graham Coxon, Green River, Grinderman, Halo33, Hartfield, Hole, Incubus, J.U.F., Jane's Addiction, Joe Jackson, Joe Strummer, Joe Strummer and The Mescaleros, Jonny Greenwood, Joy Division, KMFDM, Kultur Shock, Kyuss, Lenny Kravitz, Luminous Orange, Lush, Marilyn Manson, Martin L. Gore, Masters of Reality, Medicine, Mick Harvey, Ministry (2), Minutemen (2), Mission of Burma (2), Modwheelmood, Mondo Generator, Mother Love Bone, Mudhoney, Muse, My Bloody Valentine, Nick Cave, Nirvana, On a Friday, Pet Shop Boys, Pigface, Pixies, Pop Will Eat Itself, Pulp, Ramones, Recoil, Sex Pistols, Sonic Youth, Soundgarden (2), Stone Temple Pilots, Suede, Supergrass, Talking Heads, The Birthday Party, The Breeders, The Chameleons, The Cure, The Dukes of Stratosphear, The Fall, The Replacements, Thom Yorke, Thurston Moore, Tindersticks, Wipers, Wire, honeydip

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A lot of bands I've never heard of, but out of that lot only one band that pops up twice (the Minutemen). Been meaning to get a copy of Double Nickels on the Dime.

There's also a super-eclectic test at the same link:

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Take your top 50 artists. For each of these artists, collect the top 20 similar artists (where the artist itself is the #1 most similar). The resulting number of unique artists is your super-eclectic score. You can compute your own score at http://anthony.liekens.net/pub/scripts/last.fm/supereclectic.php

My super-eclectic score is currently



The most similar artists for my profile are The Psychedelic Furs (6), The Smiths (6), Wire (6), New Order (6), Blur (6), Pulp (6), The Jesus and Mary Chain (6), The Cure (6), Public Image Ltd. (5), Suede (5)

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(Bolded the bands not in my library)
I think that's a pass!