well, there is a positive aspect, if someone out there actually can sing, and judging from what i've seen on the x-factor auditions, a hell of a lot of people actually can't. then you could incorporate that into your 'act' as an entertainer musician/dancer etc.
i just hope the guy/girl who has the dancing fat bothan doesnt sound like they look.
There probably is room in the game for voice chat, but, the problem is the text filter, and i dont mean the profanity one, its just that, how many times have you gone to give someone a piece of your mind after a bit of bad gameplay etc, in voice chat you can tell them instantly just how rubbish you think they are, and they'll hate you forever, but, if you have to type it out, at least you have a few seconds in which to edit your outburst, so to speak, and not lose a friend forever in a moments pique.
So i guess that means i still dont think voice chat is a good idea, most players dont sound like barry manilow, or madonna... i know i dont anyway, even my singing in the shower is a source of embarassment :D