Question: who is the original singer of la bamba
[{'answer': 'Alvaro Hernández Ortiz', 'provenance': [{'wikipedia_id': '1213664', 'title': 'La Bamba (song)', 'start_paragraph_id': 8, 'start_character': 139, 'end_paragraph_id': 8, 'end_character': 161, 'bleu_score': 1.0, 'section': 'Section::::Early recordings.\n'}]}, {'provenance': [{'wikipedia_id': '1213664', 'title': 'La Bamba (song)', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 372, 'bleu_score': 0.9262685672663881, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8489707664074915288}, 'section': 'Section::::Early recordings.\n'}]}]