Question: who played the pianist sam of play it again sam theme in the movie casablanca
[{'answer': 'Dooley Wilson', 'provenance': [{'wikipedia_id': '57585', 'title': 'Casablanca (film)', 'start_paragraph_id': 1, 'start_character': 318, 'end_paragraph_id': 1, 'end_character': 331, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '57585', 'title': 'Casablanca (film)', 'start_paragraph_id': 30, 'start_character': 0, 'end_paragraph_id': 30, 'end_character': 372, 'bleu_score': 0.9679895851501501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17674769439160023277}, 'section': 'Section::::Cast.\n'}]}]