Question: who wrote the lyrics to echoes by pink floyd
[{'answer': 'Pink Floyd', 'provenance': [{'wikipedia_id': '398735', 'title': 'Echoes (Pink Floyd song)', 'start_paragraph_id': 0, 'start_character': 8, 'end_paragraph_id': 0, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '398735', 'title': 'Echoes (Pink Floyd song)', 'start_paragraph_id': 1, 'start_character': 14, 'end_paragraph_id': 1, 'end_character': 391, 'bleu_score': 0.5046639211534231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8430761925591551677}, 'section': 'Section::::Abstract.'}]}]