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Re:Play Strength, a Rdio Feature Concept by brianwhitman on Wednesday November 28, 2012 @04:21PM (#4844822)
EN (which powers the Rdio create station feature that rolled out recently) has similarity data and popularity data for songs & artists natively.

Popularity of a single song: http://developer.echonest.com/api/v4/song/search?api_key=FIL...

List of songs by an artist ordered by popularity

http://developer.echonest.com/api/v4/song/search?api_key=FIL...

Since we have Rdio in our Rosetta ID space, you can natively use Rdio IDs and get them back in your calls:

http://developer.echonest.com/api/v4/song/search?api_key=FIL...

Re:Play Strength, a Rdio Feature Concept by avand on Wednesday November 28, 2012 @05:46PM (#4845217)
#awesomesauce