Question: how many song tracks are there in the movie lagaan
[{'answer': '8', 'provenance': [{'wikipedia_id': '43583898', 'title': 'Lagaan (soundtrack)', 'start_paragraph_id': 4, 'start_character': 1312, 'end_paragraph_id': 4, 'end_character': 1313, 'bleu_score': 1.0, 'section': 'Section::::Reception.\n'}]}]