Question: who sings gonna be a heartache tonight
[{'answer': 'Eagles', 'provenance': [{'wikipedia_id': '7360098', 'title': 'Heartache Tonight', 'start_paragraph_id': 1, 'start_character': 109, 'end_paragraph_id': 1, 'end_character': 115, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7360098', 'title': 'Heartache Tonight', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 485, 'bleu_score': 0.634452171559852, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6870608599736780136}, 'section': 'Section::::Abstract.'}]}]