Excellent! Glad to hear the recommendations are good.

I find links between artists and recommend based upon that. These links include: being recommended by a human, being on the same record label, being mutual admirers, playing gigs together, being posted to the same mp3 blog, being on the same mixtapes and so on.

I wrote a post on my blog that gives a comprehensive account of how the recommendation system works: http://www.maryrosecook.com/post/show/130

And, yes, I know the UI is horrible.