When requesting a radio station seeded by the artist "The Band" (http://en.wikipedia.org/wiki/The_Band) I have also been getting tracks by an unrelated Russian artist.
Here's the spotify link for the Russian artist: https://open.spotify.com/artist/5WK3Lm6qpI1jAJerFAeFve. I assume spotify is getting its data about related artists from echonest.
If you open the spotify artist link, you'll see associated acts include "The Band," Neil Young, Creedence Clearwater Revival and The Byrds, which are indeed all related to "The Band," but almost certainly not the Russian artist.
I think the echonest algorithms have uncorrected equated "The Band" and the aforementioned Russian artist.
Is it possible for you guys to fix this data error? (In the meantime I can work around this by banning the Russian artist by default in my application.)
Thanks!