Question: who sang the song ps i love you
[{'answer': 'Rudy Vallée', 'provenance': [{'wikipedia_id': '4750176', 'title': 'P.S. I Love You (1934 song)', 'start_paragraph_id': 2, 'start_character': 49, 'end_paragraph_id': 2, 'end_character': 60, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4750176', 'title': 'P.S. I Love You (1934 song)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 270, 'bleu_score': 0.8361993316721801, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13967033374681146375}, 'section': 'Section::::Abstract.'}]}]