Question: who sang i've been loving you too long
[{'answer': 'Otis Redding', 'provenance': [{'wikipedia_id': '4725774', 'title': "I've Been Loving You Too Long", 'start_paragraph_id': 1, 'start_character': 125, 'end_paragraph_id': 1, 'end_character': 137, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]