Who was one of the first female rock singers?

My teacher igned a report on women's history,and i know that i want to do a women in rock music. But i have to include what she did/contributed and things of that nature. My friend Kaeli gave me the idea of using Janis Joplin as one of the first female rock 'n roll singers. But my only problem is,was she the first? if not,then who?