It was a teen novel I read between 1983 and 1987 (sorry cannot narrow it down more than than). The protagonist wants to win the Battle of the Bands at their high school so she recruits and starts an all-girl band called Vixen, and they designed their posters so that the V in Vixen looked like a fox’s face. I think they might have had to settle for having a boy drummer. I know I read it before 1988 because that’s when the real band Vixen first hit it big, and it was definitely before that.
Lost Classics of Teen Lit: Name That Book! 
It’s Stephanie Foster’s Rhythm of Love, which was one of Bantam’s Sweet Dreams line.
Available on the internet archive: https://archive.org/details/rhythmoflove0000fost
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OMG you are right! As soon as I saw the cover I remembered. Thank you so much!
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THANK YOU SO MUCH!! This is it, for sure.
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