This singer was classically-trained, on her way to becoming an opera singer, but it wasn't for her. She debuted as a hard rock singer in the late 70s. This single, from 1983, saw her trying to appeal to pop fans, and the video for it (which tells the story of a runaway) reminds more than one person of Michael Jackson in its choreography. This is her highest charting single in the United States. Who is the singer, what was the song?