Hard to argue. Heart was one of the most underrated power ballad bands of their time - mostly because they did a lot of pop ballads. Greatest female-led rock band ever though.
I was always a big Patty Smyth ('Scandal' lead singer) fan too - before Van Halen replaced David Lee Roth with Sammy Hagar (*yawn*) they were rumored to be considering her. That would have been an awesome pairing. Instead, we got saddled with Sammy Hagar, and Van Halen was never the same. Too bad.