Question: who sang lead on three dog night songs
[{'answer': 'Danny Hutton', 'provenance': [{'wikipedia_id': '472040', 'title': 'Three Dog Night', 'start_paragraph_id': 1, 'start_character': 108, 'end_paragraph_id': 1, 'end_character': 120, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Cory Wells', 'provenance': [{'wikipedia_id': '472040', 'title': 'Three Dog Night', 'start_paragraph_id': 1, 'start_character': 122, 'end_paragraph_id': 1, 'end_character': 132, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Chuck Negron', 'provenance': [{'wikipedia_id': '472040', 'title': 'Three Dog Night', 'start_paragraph_id': 1, 'start_character': 138, 'end_paragraph_id': 1, 'end_character': 150, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '472040', 'title': 'Three Dog Night', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 605, 'bleu_score': 0.6272912235904581, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1404339556034289736}, 'section': 'Section::::Abstract.'}]}]