3) Bat for lashes
2) Howling bells
1) Feist

Bat for Lashes and Feist aren't groups but still good (in Bat for Lashes case) and decent (in Feist's case). This should be expanded to solo artists i'm going to list my favorites.

1. Vashti Bunyan
2. S
2. Emily Haines & The Soft Skeleton
4. Linda Perhacs
5. Madeline

Of ALL time definitly Diana Ross and the Supremes but some other good female groups
Envogue
SWV
TLC

The Wreckers anyone?

The only all female band that I know of and like is Pony Up.

Female Band
 

1) Pussycat Dolls

2) Dixie Chicks

3) Spice Girls

This isn't about the worst singers. Although you are entitled to your opinion. *cough* stupid *cough*