Question: who sang the theme tune to the littlest hobo
[{'answer': 'Terry Bush', 'provenance': [{'wikipedia_id': '2113721', 'title': 'The Littlest Hobo', 'start_paragraph_id': 19, 'start_character': 283, 'end_paragraph_id': 19, 'end_character': 293, 'bleu_score': 1.0, 'section': 'Section::::1979–1985 series.:Plot.\n'}]}, {'provenance': [{'wikipedia_id': '2113721', 'title': 'The Littlest Hobo', 'start_paragraph_id': 21, 'start_character': 0, 'end_paragraph_id': 21, 'end_character': 298, 'bleu_score': 0.640478788307492, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14756796009504228643}, 'section': 'Section::::1979–1985 series.:Theme song.\n'}]}]