*Lynx cracks his knuckles and prepares for a long post...
Keith Green
Aurora
Avalon
MOC: Jersey Chica
Papa San
Shachah
Todd Agnew
Jeremiah Yocom
Josh Wilson
Cheri Keaggy
Jennifer Knapp
Cory Lamb
Go Fish
Out of the Grey
Sara Groves
Shaun Groves
Aaron Jeoffrey
Level 3:16
That's just a random sample of some of the groups in my collection that fit what you said you were looking for. If I sat down and compiled a complete list from my collection it would be much longer. And that doesn't include any of the old gospel, southern gospel, bluegrass gospel, black choir, modern choir...