Question: who did the song he ain't heavy he's my brother
[{'answer': 'Originally recorded by Kelly Gordon', 'provenance': [{'wikipedia_id': '2313904', 'title': "He Ain't Heavy, He's My Brother", 'start_paragraph_id': 1, 'start_character': 86, 'end_paragraph_id': 1, 'end_character': 121, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2313904', 'title': "He Ain't Heavy, He's My Brother", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 382, 'bleu_score': 0.9357502588195491, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2375189761528875001}, 'section': 'Section::::Abstract.'}]}]