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
81/100