I believe all the SMiLE versions have Brian on lead.
That'd be Mr.Carl Wilson.
Also, shocked Wikipedia hasn't deleted the page for "Wind Chimes" when someone when an a Beach Boys song article deleting rampage some time last year.
Also, not aware of any version of "Wind Chimes" with Brian singing except the 2004 version. Great vocal on that one, by the way.
Edit: And the Smiley Smile version! Derp.