Better yet, who can sing while playing?
My daughter can carry on a conversation while playing the piano. I can't talk at all while playing the piano. Sing? Yeah, somewhat, unless it's a challenging part and then the singing just sorta drops out.
I'm trying to learn to sing while playing the guitar. Same problem. I guess my brain has limited processing power. Time to upgrade.
Oh, you asked about singing decent? Let's just say my daughters comment that "everyone" seems to think they can sing when they get a guitar. I try not to take it personally.
(Not that I sing many indecent lyrics...)
But, yeah, I think a forum on singing would be interesting. I'd be more a reader, though, than a contributor.