How to identify a certain song?

Hello to all. I am just a noob and I how can I fix this?

I want to identify song of Van Halen, "Human Beings" like write guide on this site. I have whole song and i record only 20 seconds. Then with codegen i execute this command : codegen filestream15.mp3 10 30 > json_string.json (i get only 10 seconds of 30) is it ok ? There i execute this command : curl -F "api_key=N6E4NIOVYMTHNDM8J" -F "query=@json_string.json""http://develper.echonest.com/api/v4/song/identify" But i get always {"response": {"status": {"version": "4.2", "code": 0, "message": "Success"}, "songs": []}}

Any chance of how to fix this? Thanks