If this is what you're talking about:

I think it depends on the song that you put on the playlist. It seems that in order for MixPod to stream music, some of the songs require you to use the playlist that enables the video to work (so the music video could be played too). It's one of Youtube's terms for Mixpod. :( I don't like it. ; ; Some songs do work though w/o the music video though...just have to be lucky enough to find it. D:

If that's not what you're talking about, please disregard. xD