Question: who sang lean on me in the 90s
[{'answer': '2 - 4 Family', 'provenance': [{'wikipedia_id': '4210382', 'title': 'Lean on Me (song)', 'start_paragraph_id': 31, 'start_character': 48, 'end_paragraph_id': 31, 'end_character': 59, 'bleu_score': 1.0, 'section': 'Section::::2-4 Family version.\n'}]}, {'provenance': [{'wikipedia_id': '4210382', 'title': 'Lean on Me (song)', 'start_paragraph_id': 30, 'start_character': 0, 'end_paragraph_id': 30, 'end_character': 191, 'bleu_score': 0.75503040851236, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17520008216936630270}, 'section': 'Section::::2-4 Family version.\n'}]}]