This is VERY incomplete, but the bios of the groups seem very well thought-out:http://www.eyeneer.com/America/Genre/Gospel/Profiles/index.html
These certainly have an names:
http://www.blackgospel.com/marketplace/
Here's a general history:
http://www.ncgcc.com/ahti/2.htm
I found these on http://www.google.com/ searching for "Golden Gate Quartet" and "gospel music".
Alex