I already see why this idea didn't go anywhere the first time. While there may be musicians on the 'org, I doubt enough of them want to or can (in terms of coherence) make an AMV to their own material.The only music you can use is music which you yourself took some part in making.
Furthermore, you would likely be better off contacting directly those people you know of who do use their own songs. Chances are they don't frequent the MEP boards and won't see this notice.
You've chosen a rather tough concept for your project...