Question: what was the number one song on april 20th 2000
[{'answer': 'Maria Maria', 'provenance': [{'wikipedia_id': '474478', 'title': 'List of Billboard Hot 100 number-one singles of 2000', 'start_paragraph_id': 2, 'start_character': 318, 'end_paragraph_id': 2, 'end_character': 329, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]