Question: who sang the song it's hard to be humble
[{'answer': 'Mac Davis', 'provenance': [{'wikipedia_id': '1556326', 'title': 'Mac Davis', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 9, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1556326', 'title': 'Mac Davis', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 487, 'bleu_score': 0.8127827334498741, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3310883045874474209}, 'section': 'Section::::Abstract.'}]}]