Question: who sings the song i keep holding on
[{'answer': 'The Marvelettes', 'provenance': [{'wikipedia_id': '22351174', 'title': "I'll Keep Holding On", 'start_paragraph_id': 1, 'start_character': 117, 'end_paragraph_id': 1, 'end_character': 132, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'The Action', 'provenance': [{'wikipedia_id': '22351174', 'title': "I'll Keep Holding On", 'start_paragraph_id': 1, 'start_character': 943, 'end_paragraph_id': 1, 'end_character': 953, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Detroit Cobras', 'provenance': [{'wikipedia_id': '22351174', 'title': "I'll Keep Holding On", 'start_paragraph_id': 1, 'start_character': 1091, 'end_paragraph_id': 1, 'end_character': 1105, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '22351174', 'title': "I'll Keep Holding On", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1105, 'bleu_score': 0.977619558732261, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4306474078969431090}, 'section': 'Section::::Abstract.'}]}]