I'm probably forgetting a bunch, but this is what I came up with off the top of my head:
A
Avraham Fried
MBD
B
Abie Rotenburg
Shmulie Ungar
Shloime Gertner
Ishay Ribo
8th Day
B If they are not singing their own material
Benny Friedman
Shlomo Simcha
Berry Webber
C
Simche Friedman
Levy Falkowitz
Eli Marcus