Question: who is the original singer of the song killing me softly
[{'answer': 'Lori Lieberman', 'provenance': [{'wikipedia_id': '177228', 'title': 'Roberta Flack', 'start_paragraph_id': 18, 'start_character': 156, 'end_paragraph_id': 18, 'end_character': 170, 'bleu_score': 1.0, 'section': 'Section::::Career.:1970s.\n'}]}, {'provenance': [{'wikipedia_id': '177228', 'title': 'Roberta Flack', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 656, 'bleu_score': 0.9822204502117851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10925506545668627427}, 'section': 'Section::::Career.:1970s.\n'}]}]