OT Best all girl band of all time?

[CTMilller]

The Dixie Chicks
The Indigo Sisters
Blame Sally (not much known outside San Francisco but excellent musicians.)
MacGarrigle Sisters
MonaLisa Twins

[Townerslovechild]

The Staves,great harmonies,not bad to look at either !
How about the Spice Girls ?
Must be the most successful, I actually thought they were quite good fun.