I'm not a lawyer, but I think that just using the audio from youtube videos is a violation of the youtube api terms. You can read their terms here: https://dev

I'm not a lawyer, but I think that just using the audio from youtube videos is a violation of the youtube api terms. You can read their terms here: https://developers.google.com/youtube/terms https://developers.google.com/youtube/terms Specifically they say it is prohibited to "separate, isolate, or modify the audio or video components of any YouTube audiovisual content made available through the YouTube API;" and it is prohibited to "promote separately the audio or video components of any YouTube audiovisual content made available through the YouTube API;" Like I said, I'm not a lawyer so my interpretation could be wrong. I think in a nutshell they want you displaying the video because they have their own ads in the videos, and just streaming the audio cuts into their revenue. Hate to be a wet blanket but I recently built a service using the YouTube API (http://chartbrain.com http://chartbrain.com) and so the terms were fairly fresh in my mind. I think other services that used only the audio from YouTube have run into trouble - songza comes to mind, they were one of the first sites to do it. http://www.wired.com/listening_post/2007/11/songza-turns-yo/ http://www.wired.com/listening_post/2007/11/songza-turns-yo/