You want to use song/profile, with a parameter that looks like "track_id=rdio-US:track:the id you got from Rdio". Then pass in buckets for the various Echo Nest data you want.
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You want to use song/profile, with a parameter that looks like "track_id=rdio-US:track:the id you got from Rdio". Then pass in buckets for the various Echo Nest data you want.