Agree with mooman on both counts.
Joni Mitchell definitely deserves to be there, as do quite a few other females, e.g.another great innovator Ellen McIlwaine (Jimi Hendrix was so impressed with Ellen he used to perform with her, for free!)
Bit light on with the African wizards also, e.g. Jean Bosco Mwende, Sekou "Diamond Fingers' Diabate, Kante Manfila, etc....