Question: who sang the song we can be heroes
[{'answer': 'David Bowie', 'provenance': [{'wikipedia_id': '3239642', 'title': '"Heroes" (David Bowie song)', 'start_paragraph_id': 0, 'start_character': 20, 'end_paragraph_id': 0, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3239642', 'title': '"Heroes" (David Bowie song)', 'start_paragraph_id': 1, 'start_character': 81, 'end_paragraph_id': 1, 'end_character': 650, 'bleu_score': 0.6047753004749651, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14634246438389579204}, 'section': 'Section::::Abstract.'}]}]