Question: when did louis armstrong sing la vie en rose
[{'answer': 'June 26 , 1950', 'provenance': [{'wikipedia_id': '3941629', 'title': 'La Vie en rose', 'start_paragraph_id': 7, 'start_character': 467, 'end_paragraph_id': 7, 'end_character': 484, 'bleu_score': 1.0, 'section': 'Section::::Background and release.\n'}]}, {'provenance': [{'wikipedia_id': '3941629', 'title': 'La Vie en rose', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 609, 'bleu_score': 0.9301240913469401, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1182668157516323423}, 'section': 'Section::::Background and release.\n'}]}]