Pena often broke out in song to keep up the spirits of the miners trapped underground. And it turns out he also can sing duets. He joined Newton-John on the song "Tell me more, tell me more" from the musical "Grease" and got a big ovation.
Pena met Newton-John on a Chilean talk show the night before and she asked him to join her on stage Monday night before 10,000 fans.
Pena says "being on stage was incredible."
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