Question: when did the song dream lover come out
[{'answer': 'April 6 , 1959'}, {'provenance': [{'wikipedia_id': '4155045', 'title': 'Dream Lover', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 769, 'bleu_score': 0.8550313935250201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4368110949691891131}, 'section': 'Section::::Abstract.'}]}]