That is odd. I'm wondering if they had the 25 year rule back when they started. If so, it would have been difficult for anyone to get in, considering we're talking late 50s. I can't think off the top of my head what women were rocking back then. If the great MoTown girl groups are considered rock, then they probably would've been considered about the same time as Aretha. My music knowledge isn't deep enough to know who may have come before them, given rock's infancy.