I can't pick just one!!!!! AARRGGGHHHHH
I love all of them :-)
Yes, Janis was great, Grace too. Crissie Hynde, Joan Jett, Pat Benetar and my favourites, Heart. Saw them in concert twice in 2011 and they were fantastic! (BTW, they have a new album coming out Oct. 2, called "Fanatic").
The best ones were Janis Joplin and Grace Slick in the 60's....Stevie Nicks, Ann & Nancy Wilson, & Chrissie Hynde in the 70's!!