Question: what is the thing in the ear of singers
[{'answer': 'In - ear monitors', 'provenance': [{'wikipedia_id': '9298748', 'title': 'In-ear monitor', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Driver technology.:Balanced armature.\n'}]}, {'provenance': [{'wikipedia_id': '9298748', 'title': 'In-ear monitor', 'start_paragraph_id': 1, 'start_character': 43, 'end_paragraph_id': 1, 'end_character': 520, 'bleu_score': 0.647071569621106, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15627202290786216867}, 'section': 'Section::::Abstract.'}]}]