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What is a good classic rock song for 3 or 4 females to sing?

I am looking for a good classic rock song for 2 or 3 of my friends and myself to sing at a performance in May. I really like "I'm Every Woman" that Whitney Houston, Chaka Khan, Mary J. Blige, LeAnn Rimes, Faith Hill, and Brandy performed at the Divas Live 99. I just can't find the sheet music with all the parts (i.e. alto, soprano, etc). Does anyone have any ideas for other songs? Thanks!

You said CLASSIC ROCK, maybe you and me have a different idea of what classic rock is considered.
I would say anything by Pat Benatar, maybe, Hit me with your best shot or Heartbreaker, or Hell is for children
How about Joan Jett, I love rock and roll or Crimson Clover
Or anything by Heart, maybe, straight on , crazy on you, barracuda, etc