There is a really cool Spotify playlist builder here: <a href="http:&#x2F;&#x2F;smarterplaylists.playlistmachinery.com&#x2F;index.html" rel="nofollow">http:&#x2F;&#x2F;smarterplaylists.playlistmachinery.com&#x2F;index.html</a><p>And it&#x27;s actively maintained by some guy on Twitter.