Question: which film was the biggest box office hit of the 1960s
[{'answer': 'The Sound of Music', 'provenance': [{'wikipedia_id': '59892', 'title': 'List of highest-grossing films', 'start_paragraph_id': 14, 'start_character': 1563, 'end_paragraph_id': 14, 'end_character': 1581, 'bleu_score': 1.0, 'section': 'Section::::High-grossing films by year.\n'}]}]