MP3
MP4

Converter MP3 Code:

<iframe src="http://www.youtubeinmp3.info/mp3.php?id=<YOUTUBE_ID>"
allowtransparency="true" scrolling="no" style="border:none;"></iframe>

Converter MP4 Code:

<iframe src="http://www.youtubeinmp3.info/mp4.php?id=<YOUTUBE_ID>"
allowtransparency="true" scrolling="no" style="border:none;"></iframe>