According to Bonnie Tyler, her second big hit (after "It's A Heartache") began as a song Jim Steinman originally meant for a play on Nosferatu. He never did finish the script. But the song lives on, on its own.   

"He told me he had started writing the song for a prospective musical version of Nosferatu years before, but never finished it. Around the time we were recording, Meat Loaf had lost his voice, and after it was a hit he always used to say: “Dang. That song should have been mine!” 

‘It was written for a Nosferatu musical’: how Bonnie Tyler made Total Eclipse of the Heart