My idea's more fun, if time-consuming >_>
But it does also make collaboration and creative control easier when working in person.
Thanqol, one thing I just thought that you should be aware of is the wishes of the people who would be filmed; I think it would be important to have their consent to have footage of them posted publicly. Perhaps you could have them include their verbal consent preceding their actual recitation of the song, and then cut it out of the final video but keep the originals with their consent to avoid any potential legal trouble in the future. Plus then you won't have to actually keep track of their names and such, and they can remain comfortably anonymous to everyone (except for their faces, of course).