YouTube download mp3 converter

The job is to develop a software that will download content from YouTube and transform to mp3. Finaly we need mp3 audio files. In all you can say a YouTube to Audio (mp3) download converter. We need a easy to use software similar to: [login to view URL] The core engine have to be a DLL with a static lib. Simple calls to add URL, Delete URL by index, URLCount, Mp3 Settings, Start, Stop, OutputPath. A proxy class and settings are needed. You have to do a really simple MFC dialog based sample to show how the API works. Important: Code have to work with Unicode. VC++ 2005 and above.