I'd like to use Echo Nest's API to get tracks and play them in Spotify, but I couldn't find a nice way to get the Spotify track URI from the Echo Nest's track ID. One roundabout way would be to grab the artist/track name from an Echo Nest's track response and look up songs that match using Spotify's metadata API, but I feel like there should be a better way, especially since Spotify's native radio app is powered by Echo Nest.
Project Rosetta Stone offers some conversions from Echo Nest's ID to other ID spaces but Spotify is not included in there. Any ideas how this conversion might be done?
Update
Now it's possible: http://blog.echonest.com/post/20116429399/spotify-the-echo-nest-api-spotify-apps-just-got
The Spotify's radio app is powered by this api: http://developer.echonest.com/docs/v4/playlist.html and a private bucket...
One roundabout way would be to grab the artist/track name from an Echo Nest's track response and look up songs that match using Spotify's metadata API
That's the unique way.