Question: who sings the song it's now or never
[{'answer': 'Elvis Presley', 'provenance': [{'wikipedia_id': '16205542', 'title': "It's Now or Never (song)", 'start_paragraph_id': 1, 'start_character': 42, 'end_paragraph_id': 1, 'end_character': 55, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '16205542', 'title': "It's Now or Never (song)", 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 361, 'bleu_score': 0.6304971662740141, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12241086606709847729}, 'section': 'Section::::Background.\n'}]}]