Question: who sang the original gilligan island theme song
[{'answer': 'The Wellingtons', 'provenance': [{'wikipedia_id': '87639', 'title': "Gilligan's Island", 'start_paragraph_id': 51, 'start_character': 56, 'end_paragraph_id': 51, 'end_character': 71, 'bleu_score': 1.0, 'section': 'Section::::Production.:Theme song.\n'}]}, {'provenance': [{'wikipedia_id': '87639', 'title': "Gilligan's Island", 'start_paragraph_id': 51, 'start_character': 0, 'end_paragraph_id': 51, 'end_character': 283, 'bleu_score': 0.958740481558872, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15789610898383355246}, 'section': 'Section::::Production.:Theme song.\n'}]}]