Question: who was the original singer of the song hallelujah
[{'answer': 'Canadian singer Leonard Cohen', 'provenance': [{'wikipedia_id': '2186423', 'title': 'Hallelujah (Leonard Cohen song)', 'start_paragraph_id': 1, 'start_character': 34, 'end_paragraph_id': 1, 'end_character': 63, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2186423', 'title': 'Hallelujah (Leonard Cohen song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 328, 'bleu_score': 0.9603762111511761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 141490701288639283}, 'section': 'Section::::Abstract.'}]}]