Catalog coverage for 3rd party APIs

I've been testing the API with Deezer and Spotify catalogues for a time now, and it seems that there are a large number of tracks that are not covered in the Rosetta Stone Id spaces.

For example, '73724283' is the ID of a track on Deezer. I can get info about this track using the Deezer API, but the Echonest API finds no match for this track when I issue the following query:

http://developer.echonest.com/api/v4/song/profile?api_key=my_key&format=json&track_id=deezer:track:73724283

Does this mean that there is no information about this track on Echonest at all? And is there any information on EchoNest's coverage rate for 3rd party APIs?