Question: who was the composer who spanned the transition between classical and romantic eras
[{'answer': 'Ludwig van Beethoven', 'provenance': [{'wikipedia_id': '5288', 'title': 'Classical period (music)', 'start_paragraph_id': 4, 'start_character': 85, 'end_paragraph_id': 4, 'end_character': 105, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5288', 'title': 'Classical period (music)', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 793, 'bleu_score': 0.913380207311237, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6609816691749278464}, 'section': 'Section::::Abstract.'}]}]