Question: who was the first act on live aid
[{'answer': 'Coldstream Guards', 'provenance': [{'wikipedia_id': '143446', 'title': 'Live Aid', 'start_paragraph_id': 24, 'start_character': 4, 'end_paragraph_id': 24, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Wembley Stadium.\n'}]}]